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Finding the Fourth Proportional to 135.39, 186.80 and 86.29

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Solution

The fourth proportional to 135.39, 186.80 and 86.29 is: 119.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.39 : 186.80 = 86.29 : x
  2. Step 2: Convert to fraction form
    135.39/186.80 = 86.29/x
  3. Step 3: Cross multiply
    135.39x = 186.80 × 86.29
  4. Step 4: Simplify right side
    135.39x = 16,118.97
  5. Step 5: Solve for x
    x = 16,118.97/135.39
  6. Step 6: Final answer
    x = 119.06

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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.