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Finding the Fourth Proportional to 147.52, 221.21 and 86.62

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Solution

The fourth proportional to 147.52, 221.21 and 86.62 is: 129.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.52 : 221.21 = 86.62 : x
  2. Step 2: Convert to fraction form
    147.52/221.21 = 86.62/x
  3. Step 3: Cross multiply
    147.52x = 221.21 × 86.62
  4. Step 4: Simplify right side
    147.52x = 19,160.72
  5. Step 5: Solve for x
    x = 19,160.72/147.52
  6. Step 6: Final answer
    x = 129.88

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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.