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Finding the Fourth Proportional to 148.72, 205.20 and 89.66

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Solution

The fourth proportional to 148.72, 205.20 and 89.66 is: 123.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.72 : 205.20 = 89.66 : x
  2. Step 2: Convert to fraction form
    148.72/205.20 = 89.66/x
  3. Step 3: Cross multiply
    148.72x = 205.20 × 89.66
  4. Step 4: Simplify right side
    148.72x = 18,397.21
  5. Step 5: Solve for x
    x = 18,397.21/148.72
  6. Step 6: Final answer
    x = 123.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.