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Finding the Fourth Proportional to 391.44, 587.16 and 135.12

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Solution

The fourth proportional to 391.44, 587.16 and 135.12 is: 202.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.44 : 587.16 = 135.12 : x
  2. Step 2: Convert to fraction form
    391.44/587.16 = 135.12/x
  3. Step 3: Cross multiply
    391.44x = 587.16 × 135.12
  4. Step 4: Simplify right side
    391.44x = 79,337.06
  5. Step 5: Solve for x
    x = 79,337.06/391.44
  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.