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Finding the Fourth Proportional to 81.47, 112.56 and 69.32

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Solution

The fourth proportional to 81.47, 112.56 and 69.32 is: 95.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.47 : 112.56 = 69.32 : x
  2. Step 2: Convert to fraction form
    81.47/112.56 = 69.32/x
  3. Step 3: Cross multiply
    81.47x = 112.56 × 69.32
  4. Step 4: Simplify right side
    81.47x = 7,802.66
  5. Step 5: Solve for x
    x = 7,802.66/81.47
  6. Step 6: Final answer
    x = 95.77

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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.