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Finding the Fourth Proportional to 135.56, 187.10 and 80.31

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Solution

The fourth proportional to 135.56, 187.10 and 80.31 is: 110.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.56 : 187.10 = 80.31 : x
  2. Step 2: Convert to fraction form
    135.56/187.10 = 80.31/x
  3. Step 3: Cross multiply
    135.56x = 187.10 × 80.31
  4. Step 4: Simplify right side
    135.56x = 15,026.60
  5. Step 5: Solve for x
    x = 15,026.60/135.56
  6. Step 6: Final answer
    x = 110.85

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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.