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Finding the Fourth Proportional to 137.92, 207.20 and 99.52

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Solution

The fourth proportional to 137.92, 207.20 and 99.52 is: 149.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.92 : 207.20 = 99.52 : x
  2. Step 2: Convert to fraction form
    137.92/207.20 = 99.52/x
  3. Step 3: Cross multiply
    137.92x = 207.20 × 99.52
  4. Step 4: Simplify right side
    137.92x = 20,620.54
  5. Step 5: Solve for x
    x = 20,620.54/137.92
  6. Step 6: Final answer
    x = 149.51

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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.