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Finding the Fourth Proportional to 69.52, 103.76 and 66.55

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Solution

The fourth proportional to 69.52, 103.76 and 66.55 is: 99.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.52 : 103.76 = 66.55 : x
  2. Step 2: Convert to fraction form
    69.52/103.76 = 66.55/x
  3. Step 3: Cross multiply
    69.52x = 103.76 × 66.55
  4. Step 4: Simplify right side
    69.52x = 6,905.23
  5. Step 5: Solve for x
    x = 6,905.23/69.52
  6. Step 6: Final answer
    x = 99.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.