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Finding the Fourth Proportional to 82.88, 114.48 and 81.60

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Solution

The fourth proportional to 82.88, 114.48 and 81.60 is: 112.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.88 : 114.48 = 81.60 : x
  2. Step 2: Convert to fraction form
    82.88/114.48 = 81.60/x
  3. Step 3: Cross multiply
    82.88x = 114.48 × 81.60
  4. Step 4: Simplify right side
    82.88x = 9,341.57
  5. Step 5: Solve for x
    x = 9,341.57/82.88
  6. Step 6: Final answer
    x = 112.71

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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.