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Finding the Fourth Proportional to 81.30, 112.32 and 69.16

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Solution

The fourth proportional to 81.30, 112.32 and 69.16 is: 95.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.30 : 112.32 = 69.16 : x
  2. Step 2: Convert to fraction form
    81.30/112.32 = 69.16/x
  3. Step 3: Cross multiply
    81.30x = 112.32 × 69.16
  4. Step 4: Simplify right side
    81.30x = 7,768.05
  5. Step 5: Solve for x
    x = 7,768.05/81.30
  6. Step 6: Final answer
    x = 95.55

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.