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Finding the Fourth Proportional to 85.97, 118.74 and 69.65

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Solution

The fourth proportional to 85.97, 118.74 and 69.65 is: 96.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.97 : 118.74 = 69.65 : x
  2. Step 2: Convert to fraction form
    85.97/118.74 = 69.65/x
  3. Step 3: Cross multiply
    85.97x = 118.74 × 69.65
  4. Step 4: Simplify right side
    85.97x = 8,269.65
  5. Step 5: Solve for x
    x = 8,269.65/85.97
  6. Step 6: Final answer
    x = 96.20

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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.