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Finding the Fourth Proportional to 112.99, 168.84 and 92.72

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Solution

The fourth proportional to 112.99, 168.84 and 92.72 is: 138.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.99 : 168.84 = 92.72 : x
  2. Step 2: Convert to fraction form
    112.99/168.84 = 92.72/x
  3. Step 3: Cross multiply
    112.99x = 168.84 × 92.72
  4. Step 4: Simplify right side
    112.99x = 15,654.84
  5. Step 5: Solve for x
    x = 15,654.84/112.99
  6. Step 6: Final answer
    x = 138.55

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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.