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Finding the Fourth Proportional to 135.56, 187.10 and 86.42

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Solution

The fourth proportional to 135.56, 187.10 and 86.42 is: 119.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.56 : 187.10 = 86.42 : x
  2. Step 2: Convert to fraction form
    135.56/187.10 = 86.42/x
  3. Step 3: Cross multiply
    135.56x = 187.10 × 86.42
  4. Step 4: Simplify right side
    135.56x = 16,169.87
  5. Step 5: Solve for x
    x = 16,169.87/135.56
  6. Step 6: Final answer
    x = 119.28

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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.