Finding the Fourth Proportional to 20,781,211.20, 31,124,577.60 and 13,128,460.80
Calculator
Solution
The fourth proportional to 20,781,211.20, 31,124,577.60 and 13,128,460.80 is: 19,662,847.99
Step by Step Solution
- Step 1: Write the proportion equation
20,781,211.20 : 31,124,577.60 = 13,128,460.80 : x - Step 2: Convert to fraction form
20,781,211.20/31,124,577.60 = 13,128,460.80/x - Step 3: Cross multiply
20,781,211.20x = 31,124,577.60 × 13,128,460.80 - Step 4: Simplify right side
20,781,211.20x = 408,617,796,938,158.12 - Step 5: Solve for x
x = 408,617,796,938,158.12/20,781,211.20 - Step 6: Final answer
x = 19,662,847.99
Related Problems
Find fourth proportional to 10,390,605.60, 15,562,288.80 and 6,564,230.40
Half scale
Find fourth proportional to 41,562,422.40, 62,249,155.20 and 26,256,921.60
Double scale
Find fourth proportional to 20,781,212.20, 31,124,579.10 and 13,128,461.80
Similar ratio
Find fourth proportional to 31,171,816.80, 46,686,866.40 and 19,692,691.20
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.