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Finding the Fourth Proportional to 69.60, 95.76 and 66.18

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Solution

The fourth proportional to 69.60, 95.76 and 66.18 is: 91.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.60 : 95.76 = 66.18 : x
  2. Step 2: Convert to fraction form
    69.60/95.76 = 66.18/x
  3. Step 3: Cross multiply
    69.60x = 95.76 × 66.18
  4. Step 4: Simplify right side
    69.60x = 6,337.40
  5. Step 5: Solve for x
    x = 6,337.40/69.60
  6. Step 6: Final answer
    x = 91.05

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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.