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Finding the Fourth Proportional to 81.93, 112.91 and 79.53

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Solution

The fourth proportional to 81.93, 112.91 and 79.53 is: 109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.93 : 112.91 = 79.53 : x
  2. Step 2: Convert to fraction form
    81.93/112.91 = 79.53/x
  3. Step 3: Cross multiply
    81.93x = 112.91 × 79.53
  4. Step 4: Simplify right side
    81.93x = 8,979.33
  5. Step 5: Solve for x
    x = 8,979.33/81.93
  6. Step 6: Final answer
    x = 109.60

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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.