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Finding the Fourth Proportional to 63.80, 95.64 and 28.60

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Solution

The fourth proportional to 63.80, 95.64 and 28.60 is: 42.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.80 : 95.64 = 28.60 : x
  2. Step 2: Convert to fraction form
    63.80/95.64 = 28.60/x
  3. Step 3: Cross multiply
    63.80x = 95.64 × 28.60
  4. Step 4: Simplify right side
    63.80x = 2,735.30
  5. Step 5: Solve for x
    x = 2,735.30/63.80
  6. Step 6: Final answer
    x = 42.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.