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Finding the Fourth Proportional to 151.66, 209.30 and 86.17

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Solution

The fourth proportional to 151.66, 209.30 and 86.17 is: 118.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.66 : 209.30 = 86.17 : x
  2. Step 2: Convert to fraction form
    151.66/209.30 = 86.17/x
  3. Step 3: Cross multiply
    151.66x = 209.30 × 86.17
  4. Step 4: Simplify right side
    151.66x = 18,035.38
  5. Step 5: Solve for x
    x = 18,035.38/151.66
  6. Step 6: Final answer
    x = 118.92

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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.