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Finding the Fourth Proportional to 100,504.78, 138,691.92 and 60,240.76

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Solution

The fourth proportional to 100,504.78, 138,691.92 and 60,240.76 is: 83,129.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,504.78 : 138,691.92 = 60,240.76 : x
  2. Step 2: Convert to fraction form
    100,504.78/138,691.92 = 60,240.76/x
  3. Step 3: Cross multiply
    100,504.78x = 138,691.92 × 60,240.76
  4. Step 4: Simplify right side
    100,504.78x = 8,354,906,666.66
  5. Step 5: Solve for x
    x = 8,354,906,666.66/100,504.78
  6. Step 6: Final answer
    x = 83,129.45

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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.