Home / 129,371.20-178,519.56-72,781.36

Finding the Fourth Proportional to 129,371.20, 178,519.56 and 72,781.36

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Solution

The fourth proportional to 129,371.20, 178,519.56 and 72,781.36 is: 100,431.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,371.20 : 178,519.56 = 72,781.36 : x
  2. Step 2: Convert to fraction form
    129,371.20/178,519.56 = 72,781.36/x
  3. Step 3: Cross multiply
    129,371.20x = 178,519.56 × 72,781.36
  4. Step 4: Simplify right side
    129,371.20x = 12,992,896,363.40
  5. Step 5: Solve for x
    x = 12,992,896,363.40/129,371.20
  6. Step 6: Final answer
    x = 100,431.13

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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.