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Finding the Fourth Proportional to 392.43, 588.59 and 103.87

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Solution

The fourth proportional to 392.43, 588.59 and 103.87 is: 155.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.43 : 588.59 = 103.87 : x
  2. Step 2: Convert to fraction form
    392.43/588.59 = 103.87/x
  3. Step 3: Cross multiply
    392.43x = 588.59 × 103.87
  4. Step 4: Simplify right side
    392.43x = 61,133.38
  5. Step 5: Solve for x
    x = 61,133.38/392.43
  6. Step 6: Final answer
    x = 155.78

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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.