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Finding the Fourth Proportional to 392,691.38, 589,037.06 and 126,478.80

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Solution

The fourth proportional to 392,691.38, 589,037.06 and 126,478.80 is: 189,718.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,691.38 : 589,037.06 = 126,478.80 : x
  2. Step 2: Convert to fraction form
    392,691.38/589,037.06 = 126,478.80/x
  3. Step 3: Cross multiply
    392,691.38x = 589,037.06 × 126,478.80
  4. Step 4: Simplify right side
    392,691.38x = 74,500,700,820.53
  5. Step 5: Solve for x
    x = 74,500,700,820.53/392,691.38
  6. Step 6: Final answer
    x = 189,718.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.