Home / 129,332.12-178,463.88-72,742.28

Finding the Fourth Proportional to 129,332.12, 178,463.88 and 72,742.28

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Solution

The fourth proportional to 129,332.12, 178,463.88 and 72,742.28 is: 100,376.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,332.12 : 178,463.88 = 72,742.28 : x
  2. Step 2: Convert to fraction form
    129,332.12/178,463.88 = 72,742.28/x
  3. Step 3: Cross multiply
    129,332.12x = 178,463.88 × 72,742.28
  4. Step 4: Simplify right side
    129,332.12x = 12,981,869,528.85
  5. Step 5: Solve for x
    x = 12,981,869,528.85/129,332.12
  6. Step 6: Final answer
    x = 100,376.22

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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.