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Finding the Fourth Proportional to 85.58, 118.01 and 81.24

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Solution

The fourth proportional to 85.58, 118.01 and 81.24 is: 112.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.58 : 118.01 = 81.24 : x
  2. Step 2: Convert to fraction form
    85.58/118.01 = 81.24/x
  3. Step 3: Cross multiply
    85.58x = 118.01 × 81.24
  4. Step 4: Simplify right side
    85.58x = 9,587.13
  5. Step 5: Solve for x
    x = 9,587.13/85.58
  6. Step 6: Final answer
    x = 112.03

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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.