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Finding the Fourth Proportional to 112.80, 168.43 and 92.55

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Solution

The fourth proportional to 112.80, 168.43 and 92.55 is: 138.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.80 : 168.43 = 92.55 : x
  2. Step 2: Convert to fraction form
    112.80/168.43 = 92.55/x
  3. Step 3: Cross multiply
    112.80x = 168.43 × 92.55
  4. Step 4: Simplify right side
    112.80x = 15,588.20
  5. Step 5: Solve for x
    x = 15,588.20/112.80
  6. Step 6: Final answer
    x = 138.19

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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.