Finding the Fourth Proportional to 81,257.79, 121,785.12 and 39,130.02
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Solution
The fourth proportional to 81,257.79, 121,785.12 and 39,130.02 is: 58,646.12
Step by Step Solution
- Step 1: Write the proportion equation
81,257.79 : 121,785.12 = 39,130.02 : x - Step 2: Convert to fraction form
81,257.79/121,785.12 = 39,130.02/x - Step 3: Cross multiply
81,257.79x = 121,785.12 × 39,130.02 - Step 4: Simplify right side
81,257.79x = 4,765,454,181.30 - Step 5: Solve for x
x = 4,765,454,181.30/81,257.79 - Step 6: Final answer
x = 58,646.12
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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.