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Finding the Fourth Proportional to 104.62, 156.88 and 61.28

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Solution

The fourth proportional to 104.62, 156.88 and 61.28 is: 91.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.62 : 156.88 = 61.28 : x
  2. Step 2: Convert to fraction form
    104.62/156.88 = 61.28/x
  3. Step 3: Cross multiply
    104.62x = 156.88 × 61.28
  4. Step 4: Simplify right side
    104.62x = 9,613.61
  5. Step 5: Solve for x
    x = 9,613.61/104.62
  6. Step 6: Final answer
    x = 91.89

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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.