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Finding the Fourth Proportional to 109.60, 163.72 and 77.52

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Solution

The fourth proportional to 109.60, 163.72 and 77.52 is: 115.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.60 : 163.72 = 77.52 : x
  2. Step 2: Convert to fraction form
    109.60/163.72 = 77.52/x
  3. Step 3: Cross multiply
    109.60x = 163.72 × 77.52
  4. Step 4: Simplify right side
    109.60x = 12,691.57
  5. Step 5: Solve for x
    x = 12,691.57/109.60
  6. Step 6: Final answer
    x = 115.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.