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Finding the Fourth Proportional to 69.12, 95.39 and 40

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Solution

The fourth proportional to 69.12, 95.39 and 40 is: 55.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.12 : 95.39 = 40 : x
  2. Step 2: Convert to fraction form
    69.12/95.39 = 40/x
  3. Step 3: Cross multiply
    69.12x = 95.39 × 40
  4. Step 4: Simplify right side
    69.12x = 3,815.60
  5. Step 5: Solve for x
    x = 3,815.60/69.12
  6. Step 6: Final answer
    x = 55.20

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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.