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Finding the Fourth Proportional to 104.75, 144.50 and 63.28

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Solution

The fourth proportional to 104.75, 144.50 and 63.28 is: 87.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.75 : 144.50 = 63.28 : x
  2. Step 2: Convert to fraction form
    104.75/144.50 = 63.28/x
  3. Step 3: Cross multiply
    104.75x = 144.50 × 63.28
  4. Step 4: Simplify right side
    104.75x = 9,143.76
  5. Step 5: Solve for x
    x = 9,143.76/104.75
  6. Step 6: Final answer
    x = 87.29

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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.