Home / 129,342.18-178,489.32-71,979.90

Finding the Fourth Proportional to 129,342.18, 178,489.32 and 71,979.90

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Solution

The fourth proportional to 129,342.18, 178,489.32 and 71,979.90 is: 99,330.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,342.18 : 178,489.32 = 71,979.90 : x
  2. Step 2: Convert to fraction form
    129,342.18/178,489.32 = 71,979.90/x
  3. Step 3: Cross multiply
    129,342.18x = 178,489.32 × 71,979.90
  4. Step 4: Simplify right side
    129,342.18x = 12,847,643,404.67
  5. Step 5: Solve for x
    x = 12,847,643,404.67/129,342.18
  6. Step 6: Final answer
    x = 99,330.65

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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.