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Finding the Fourth Proportional to 151.57, 209.09 and 99.11

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Solution

The fourth proportional to 151.57, 209.09 and 99.11 is: 136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.57 : 209.09 = 99.11 : x
  2. Step 2: Convert to fraction form
    151.57/209.09 = 99.11/x
  3. Step 3: Cross multiply
    151.57x = 209.09 × 99.11
  4. Step 4: Simplify right side
    151.57x = 20,722.91
  5. Step 5: Solve for x
    x = 20,722.91/151.57
  6. Step 6: Final answer
    x = 136.72

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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.