Home / 129,587.43-178,890.69-91,378.11

Finding the Fourth Proportional to 129,587.43, 178,890.69 and 91,378.11

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Solution

The fourth proportional to 129,587.43, 178,890.69 and 91,378.11 is: 126,144.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,587.43 : 178,890.69 = 91,378.11 : x
  2. Step 2: Convert to fraction form
    129,587.43/178,890.69 = 91,378.11/x
  3. Step 3: Cross multiply
    129,587.43x = 178,890.69 × 91,378.11
  4. Step 4: Simplify right side
    129,587.43x = 16,346,693,148.80
  5. Step 5: Solve for x
    x = 16,346,693,148.80/129,587.43
  6. Step 6: Final answer
    x = 126,144.13

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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.