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Finding the Fourth Proportional to 80.93, 112.25 and 78.71

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Solution

The fourth proportional to 80.93, 112.25 and 78.71 is: 109.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.93 : 112.25 = 78.71 : x
  2. Step 2: Convert to fraction form
    80.93/112.25 = 78.71/x
  3. Step 3: Cross multiply
    80.93x = 112.25 × 78.71
  4. Step 4: Simplify right side
    80.93x = 8,834.83
  5. Step 5: Solve for x
    x = 8,834.83/80.93
  6. Step 6: Final answer
    x = 109.16

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.