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Finding the Fourth Proportional to 69.60, 95.48 and 66.96

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Solution

The fourth proportional to 69.60, 95.48 and 66.96 is: 91.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.60 : 95.48 = 66.96 : x
  2. Step 2: Convert to fraction form
    69.60/95.48 = 66.96/x
  3. Step 3: Cross multiply
    69.60x = 95.48 × 66.96
  4. Step 4: Simplify right side
    69.60x = 6,393.34
  5. Step 5: Solve for x
    x = 6,393.34/69.60
  6. Step 6: Final answer
    x = 91.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.