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Finding the Fourth Proportional to 105.52, 145.70 and 80.92

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Solution

The fourth proportional to 105.52, 145.70 and 80.92 is: 111.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.52 : 145.70 = 80.92 : x
  2. Step 2: Convert to fraction form
    105.52/145.70 = 80.92/x
  3. Step 3: Cross multiply
    105.52x = 145.70 × 80.92
  4. Step 4: Simplify right side
    105.52x = 11,790.04
  5. Step 5: Solve for x
    x = 11,790.04/105.52
  6. Step 6: Final answer
    x = 111.73

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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.