Finding the Fourth Proportional to 663,071.81, 915,149.64 and 391,207.05
Calculator
Solution
The fourth proportional to 663,071.81, 915,149.64 and 391,207.05 is: 539,930.95
Step by Step Solution
- Step 1: Write the proportion equation
663,071.81 : 915,149.64 = 391,207.05 : x - Step 2: Convert to fraction form
663,071.81/915,149.64 = 391,207.05/x - Step 3: Cross multiply
663,071.81x = 915,149.64 × 391,207.05 - Step 4: Simplify right side
663,071.81x = 358,012,990,972.96 - Step 5: Solve for x
x = 358,012,990,972.96/663,071.81 - Step 6: Final answer
x = 539,930.95
Related Problems
Find fourth proportional to 331,535.90, 457,574.82 and 195,603.53
Half scale
Find fourth proportional to 1,326,143.61, 1,830,299.28 and 782,414.10
Double scale
Find fourth proportional to 663,072.81, 915,151.02 and 391,208.05
Similar ratio
Find fourth proportional to 994,607.71, 1,372,724.46 and 586,810.58
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.