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Finding the Fourth Proportional to 81.72, 112.84 and 75.58

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Solution

The fourth proportional to 81.72, 112.84 and 75.58 is: 104.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.72 : 112.84 = 75.58 : x
  2. Step 2: Convert to fraction form
    81.72/112.84 = 75.58/x
  3. Step 3: Cross multiply
    81.72x = 112.84 × 75.58
  4. Step 4: Simplify right side
    81.72x = 8,528.45
  5. Step 5: Solve for x
    x = 8,528.45/81.72
  6. Step 6: Final answer
    x = 104.36

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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.