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Finding the Fourth Proportional to 391.68, 587.52 and 135.12

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Solution

The fourth proportional to 391.68, 587.52 and 135.12 is: 202.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.68 : 587.52 = 135.12 : x
  2. Step 2: Convert to fraction form
    391.68/587.52 = 135.12/x
  3. Step 3: Cross multiply
    391.68x = 587.52 × 135.12
  4. Step 4: Simplify right side
    391.68x = 79,385.70
  5. Step 5: Solve for x
    x = 79,385.70/391.68
  6. Step 6: Final answer
    x = 202.68

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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.