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Finding the Fourth Proportional to 85.55, 118.26 and 81.92

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Solution

The fourth proportional to 85.55, 118.26 and 81.92 is: 113.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.55 : 118.26 = 81.92 : x
  2. Step 2: Convert to fraction form
    85.55/118.26 = 81.92/x
  3. Step 3: Cross multiply
    85.55x = 118.26 × 81.92
  4. Step 4: Simplify right side
    85.55x = 9,688.15
  5. Step 5: Solve for x
    x = 9,688.15/85.55
  6. Step 6: Final answer
    x = 113.25

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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.