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Finding the Fourth Proportional to 69.25, 95.57 and 40.15

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Solution

The fourth proportional to 69.25, 95.57 and 40.15 is: 55.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.25 : 95.57 = 40.15 : x
  2. Step 2: Convert to fraction form
    69.25/95.57 = 40.15/x
  3. Step 3: Cross multiply
    69.25x = 95.57 × 40.15
  4. Step 4: Simplify right side
    69.25x = 3,837.14
  5. Step 5: Solve for x
    x = 3,837.14/69.25
  6. Step 6: Final answer
    x = 55.41

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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.