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Finding the Fourth Proportional to 392.35, 588.46 and 103.81

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Solution

The fourth proportional to 392.35, 588.46 and 103.81 is: 155.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.35 : 588.46 = 103.81 : x
  2. Step 2: Convert to fraction form
    392.35/588.46 = 103.81/x
  3. Step 3: Cross multiply
    392.35x = 588.46 × 103.81
  4. Step 4: Simplify right side
    392.35x = 61,084.57
  5. Step 5: Solve for x
    x = 61,084.57/392.35
  6. Step 6: Final answer
    x = 155.69

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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.