Home / 129,318.20-178,446.50-72,728.36

Finding the Fourth Proportional to 129,318.20, 178,446.50 and 72,728.36

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Solution

The fourth proportional to 129,318.20, 178,446.50 and 72,728.36 is: 100,358.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,318.20 : 178,446.50 = 72,728.36 : x
  2. Step 2: Convert to fraction form
    129,318.20/178,446.50 = 72,728.36/x
  3. Step 3: Cross multiply
    129,318.20x = 178,446.50 × 72,728.36
  4. Step 4: Simplify right side
    129,318.20x = 12,978,121,292.74
  5. Step 5: Solve for x
    x = 12,978,121,292.74/129,318.20
  6. Step 6: Final answer
    x = 100,358.04

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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.