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Finding the Fourth Proportional to 81.33, 112.17 and 64.77

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Solution

The fourth proportional to 81.33, 112.17 and 64.77 is: 89.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.33 : 112.17 = 64.77 : x
  2. Step 2: Convert to fraction form
    81.33/112.17 = 64.77/x
  3. Step 3: Cross multiply
    81.33x = 112.17 × 64.77
  4. Step 4: Simplify right side
    81.33x = 7,265.25
  5. Step 5: Solve for x
    x = 7,265.25/81.33
  6. Step 6: Final answer
    x = 89.33

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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.