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Finding the Fourth Proportional to 95.50, 131.88 and 66.47

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Solution

The fourth proportional to 95.50, 131.88 and 66.47 is: 91.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.50 : 131.88 = 66.47 : x
  2. Step 2: Convert to fraction form
    95.50/131.88 = 66.47/x
  3. Step 3: Cross multiply
    95.50x = 131.88 × 66.47
  4. Step 4: Simplify right side
    95.50x = 8,766.06
  5. Step 5: Solve for x
    x = 8,766.06/95.50
  6. Step 6: Final answer
    x = 91.79

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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.