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Finding the Fourth Proportional to 104.72, 156.90 and 77.60

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Solution

The fourth proportional to 104.72, 156.90 and 77.60 is: 116.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.72 : 156.90 = 77.60 : x
  2. Step 2: Convert to fraction form
    104.72/156.90 = 77.60/x
  3. Step 3: Cross multiply
    104.72x = 156.90 × 77.60
  4. Step 4: Simplify right side
    104.72x = 12,175.44
  5. Step 5: Solve for x
    x = 12,175.44/104.72
  6. Step 6: Final answer
    x = 116.27

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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.