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Finding the Fourth Proportional to 135.33, 186.69 and 86.13

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Solution

The fourth proportional to 135.33, 186.69 and 86.13 is: 118.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.33 : 186.69 = 86.13 : x
  2. Step 2: Convert to fraction form
    135.33/186.69 = 86.13/x
  3. Step 3: Cross multiply
    135.33x = 186.69 × 86.13
  4. Step 4: Simplify right side
    135.33x = 16,079.61
  5. Step 5: Solve for x
    x = 16,079.61/135.33
  6. Step 6: Final answer
    x = 118.82

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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.