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Finding the Fourth Proportional to 104.74, 156.78 and 77.68

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Solution

The fourth proportional to 104.74, 156.78 and 77.68 is: 116.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.74 : 156.78 = 77.68 : x
  2. Step 2: Convert to fraction form
    104.74/156.78 = 77.68/x
  3. Step 3: Cross multiply
    104.74x = 156.78 × 77.68
  4. Step 4: Simplify right side
    104.74x = 12,178.67
  5. Step 5: Solve for x
    x = 12,178.67/104.74
  6. Step 6: Final answer
    x = 116.28

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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.