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Finding the Fourth Proportional to 151.89, 209.62 and 86.39

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Solution

The fourth proportional to 151.89, 209.62 and 86.39 is: 119.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.89 : 209.62 = 86.39 : x
  2. Step 2: Convert to fraction form
    151.89/209.62 = 86.39/x
  3. Step 3: Cross multiply
    151.89x = 209.62 × 86.39
  4. Step 4: Simplify right side
    151.89x = 18,109.07
  5. Step 5: Solve for x
    x = 18,109.07/151.89
  6. Step 6: Final answer
    x = 119.22

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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.