Finding the Fourth Proportional to 521,640,989.80, 782,461,484.70 and 279,776,285.80
Calculator
Solution
The fourth proportional to 521,640,989.80, 782,461,484.70 and 279,776,285.80 is: 419,664,428.70
Step by Step Solution
- Step 1: Write the proportion equation
521,640,989.80 : 782,461,484.70 = 279,776,285.80 : x - Step 2: Convert to fraction form
521,640,989.80/782,461,484.70 = 279,776,285.80/x - Step 3: Cross multiply
521,640,989.80x = 782,461,484.70 × 279,776,285.80 - Step 4: Simplify right side
521,640,989.80x = 218,914,167,970,919,552 - Step 5: Solve for x
x = 218,914,167,970,919,552/521,640,989.80 - Step 6: Final answer
x = 419,664,428.70
Related Problems
Find fourth proportional to 260,820,494.90, 391,230,742.35 and 139,888,142.90
Half scale
Find fourth proportional to 1,043,281,979.60, 1,564,922,969.40 and 559,552,571.60
Double scale
Find fourth proportional to 521,640,990.80, 782,461,486.20 and 279,776,286.80
Similar ratio
Find fourth proportional to 782,461,484.70, 1,173,692,227.05 and 419,664,428.70
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.