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Finding the Fourth Proportional to 135.80, 187.31 and 86.74

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Solution

The fourth proportional to 135.80, 187.31 and 86.74 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.80 : 187.31 = 86.74 : x
  2. Step 2: Convert to fraction form
    135.80/187.31 = 86.74/x
  3. Step 3: Cross multiply
    135.80x = 187.31 × 86.74
  4. Step 4: Simplify right side
    135.80x = 16,247.02
  5. Step 5: Solve for x
    x = 16,247.02/135.80
  6. Step 6: Final answer
    x = 119.64

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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.