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Finding the Fourth Proportional to 151.70, 209.33 and 86.19

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Solution

The fourth proportional to 151.70, 209.33 and 86.19 is: 118.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.70 : 209.33 = 86.19 : x
  2. Step 2: Convert to fraction form
    151.70/209.33 = 86.19/x
  3. Step 3: Cross multiply
    151.70x = 209.33 × 86.19
  4. Step 4: Simplify right side
    151.70x = 18,042.04
  5. Step 5: Solve for x
    x = 18,042.04/151.70
  6. Step 6: Final answer
    x = 118.93

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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.