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Finding the Fourth Proportional to 110.82, 152.94 and 81.72

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Solution

The fourth proportional to 110.82, 152.94 and 81.72 is: 112.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.82 : 152.94 = 81.72 : x
  2. Step 2: Convert to fraction form
    110.82/152.94 = 81.72/x
  3. Step 3: Cross multiply
    110.82x = 152.94 × 81.72
  4. Step 4: Simplify right side
    110.82x = 12,498.26
  5. Step 5: Solve for x
    x = 12,498.26/110.82
  6. Step 6: Final answer
    x = 112.78

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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.