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Finding the Fourth Proportional to 392.46, 588.70 and 103.92

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Solution

The fourth proportional to 392.46, 588.70 and 103.92 is: 155.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.46 : 588.70 = 103.92 : x
  2. Step 2: Convert to fraction form
    392.46/588.70 = 103.92/x
  3. Step 3: Cross multiply
    392.46x = 588.70 × 103.92
  4. Step 4: Simplify right side
    392.46x = 61,177.70
  5. Step 5: Solve for x
    x = 61,177.70/392.46
  6. Step 6: Final answer
    x = 155.88

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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.