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Finding the Fourth Proportional to 112.55, 155.31 and 65.92

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Solution

The fourth proportional to 112.55, 155.31 and 65.92 is: 90.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.55 : 155.31 = 65.92 : x
  2. Step 2: Convert to fraction form
    112.55/155.31 = 65.92/x
  3. Step 3: Cross multiply
    112.55x = 155.31 × 65.92
  4. Step 4: Simplify right side
    112.55x = 10,238.04
  5. Step 5: Solve for x
    x = 10,238.04/112.55
  6. Step 6: Final answer
    x = 90.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.