Home / 129,539.38-178,761.66-72,178.48

Finding the Fourth Proportional to 129,539.38, 178,761.66 and 72,178.48

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Solution

The fourth proportional to 129,539.38, 178,761.66 and 72,178.48 is: 99,604.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,539.38 : 178,761.66 = 72,178.48 : x
  2. Step 2: Convert to fraction form
    129,539.38/178,761.66 = 72,178.48/x
  3. Step 3: Cross multiply
    129,539.38x = 178,761.66 × 72,178.48
  4. Step 4: Simplify right side
    129,539.38x = 12,902,744,901.08
  5. Step 5: Solve for x
    x = 12,902,744,901.08/129,539.38
  6. Step 6: Final answer
    x = 99,604.81

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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.