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Finding the Fourth Proportional to 133.92, 200.52 and 85.68

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Solution

The fourth proportional to 133.92, 200.52 and 85.68 is: 128.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.92 : 200.52 = 85.68 : x
  2. Step 2: Convert to fraction form
    133.92/200.52 = 85.68/x
  3. Step 3: Cross multiply
    133.92x = 200.52 × 85.68
  4. Step 4: Simplify right side
    133.92x = 17,180.55
  5. Step 5: Solve for x
    x = 17,180.55/133.92
  6. Step 6: Final answer
    x = 128.29

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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.