Finding the Fourth Proportional to 81,325.40, 121,988.10 and 31,407.80
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Solution
The fourth proportional to 81,325.40, 121,988.10 and 31,407.80 is: 47,111.70
Step by Step Solution
- Step 1: Write the proportion equation
81,325.40 : 121,988.10 = 31,407.80 : x - Step 2: Convert to fraction form
81,325.40/121,988.10 = 31,407.80/x - Step 3: Cross multiply
81,325.40x = 121,988.10 × 31,407.80 - Step 4: Simplify right side
81,325.40x = 3,831,377,847.18 - Step 5: Solve for x
x = 3,831,377,847.18/81,325.40 - Step 6: Final answer
x = 47,111.70
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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.