Home / 129,320.28-178,463.61-72,731.66

Finding the Fourth Proportional to 129,320.28, 178,463.61 and 72,731.66

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Solution

The fourth proportional to 129,320.28, 178,463.61 and 72,731.66 is: 100,370.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,320.28 : 178,463.61 = 72,731.66 : x
  2. Step 2: Convert to fraction form
    129,320.28/178,463.61 = 72,731.66/x
  3. Step 3: Cross multiply
    129,320.28x = 178,463.61 × 72,731.66
  4. Step 4: Simplify right side
    129,320.28x = 12,979,953,712.57
  5. Step 5: Solve for x
    x = 12,979,953,712.57/129,320.28
  6. Step 6: Final answer
    x = 100,370.60

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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.