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Finding the Fourth Proportional to 392.72, 588.64 and 136.16

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Solution

The fourth proportional to 392.72, 588.64 and 136.16 is: 204.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.72 : 588.64 = 136.16 : x
  2. Step 2: Convert to fraction form
    392.72/588.64 = 136.16/x
  3. Step 3: Cross multiply
    392.72x = 588.64 × 136.16
  4. Step 4: Simplify right side
    392.72x = 80,149.22
  5. Step 5: Solve for x
    x = 80,149.22/392.72
  6. Step 6: Final answer
    x = 204.09

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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.