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Finding the Fourth Proportional to 69.50, 95.90 and 40.39

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Solution

The fourth proportional to 69.50, 95.90 and 40.39 is: 55.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.50 : 95.90 = 40.39 : x
  2. Step 2: Convert to fraction form
    69.50/95.90 = 40.39/x
  3. Step 3: Cross multiply
    69.50x = 95.90 × 40.39
  4. Step 4: Simplify right side
    69.50x = 3,873.26
  5. Step 5: Solve for x
    x = 3,873.26/69.50
  6. Step 6: Final answer
    x = 55.73

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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.