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Finding the Fourth Proportional to 85.75, 118.36 and 68.29

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Solution

The fourth proportional to 85.75, 118.36 and 68.29 is: 94.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.75 : 118.36 = 68.29 : x
  2. Step 2: Convert to fraction form
    85.75/118.36 = 68.29/x
  3. Step 3: Cross multiply
    85.75x = 118.36 × 68.29
  4. Step 4: Simplify right side
    85.75x = 8,082.46
  5. Step 5: Solve for x
    x = 8,082.46/85.75
  6. Step 6: Final answer
    x = 94.26

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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.