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Finding the Fourth Proportional to 151.68, 209.22 and 99.16

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Solution

The fourth proportional to 151.68, 209.22 and 99.16 is: 136.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.68 : 209.22 = 99.16 : x
  2. Step 2: Convert to fraction form
    151.68/209.22 = 99.16/x
  3. Step 3: Cross multiply
    151.68x = 209.22 × 99.16
  4. Step 4: Simplify right side
    151.68x = 20,746.26
  5. Step 5: Solve for x
    x = 20,746.26/151.68
  6. Step 6: Final answer
    x = 136.78

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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.