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Finding the Fourth Proportional to 147.62, 221.49 and 66.47

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Solution

The fourth proportional to 147.62, 221.49 and 66.47 is: 99.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.62 : 221.49 = 66.47 : x
  2. Step 2: Convert to fraction form
    147.62/221.49 = 66.47/x
  3. Step 3: Cross multiply
    147.62x = 221.49 × 66.47
  4. Step 4: Simplify right side
    147.62x = 14,721.33
  5. Step 5: Solve for x
    x = 14,721.33/147.62
  6. Step 6: Final answer
    x = 99.72

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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.