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Finding the Fourth Proportional to 104.35, 156.43 and 76.86

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Solution

The fourth proportional to 104.35, 156.43 and 76.86 is: 115.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.35 : 156.43 = 76.86 : x
  2. Step 2: Convert to fraction form
    104.35/156.43 = 76.86/x
  3. Step 3: Cross multiply
    104.35x = 156.43 × 76.86
  4. Step 4: Simplify right side
    104.35x = 12,023.21
  5. Step 5: Solve for x
    x = 12,023.21/104.35
  6. Step 6: Final answer
    x = 115.22

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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.