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Finding the Fourth Proportional to 151.64, 209.23 and 99.19

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Solution

The fourth proportional to 151.64, 209.23 and 99.19 is: 136.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.64 : 209.23 = 99.19 : x
  2. Step 2: Convert to fraction form
    151.64/209.23 = 99.19/x
  3. Step 3: Cross multiply
    151.64x = 209.23 × 99.19
  4. Step 4: Simplify right side
    151.64x = 20,753.54
  5. Step 5: Solve for x
    x = 20,753.54/151.64
  6. Step 6: Final answer
    x = 136.86

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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.