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Finding the Fourth Proportional to 115.92, 173.92 and 61.80

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Solution

The fourth proportional to 115.92, 173.92 and 61.80 is: 92.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.92 : 173.92 = 61.80 : x
  2. Step 2: Convert to fraction form
    115.92/173.92 = 61.80/x
  3. Step 3: Cross multiply
    115.92x = 173.92 × 61.80
  4. Step 4: Simplify right side
    115.92x = 10,748.26
  5. Step 5: Solve for x
    x = 10,748.26/115.92
  6. Step 6: Final answer
    x = 92.72

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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.