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Finding the Fourth Proportional to 69, 103.49 and 40.15

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Solution

The fourth proportional to 69, 103.49 and 40.15 is: 60.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    69 : 103.49 = 40.15 : x
  2. Step 2: Convert to fraction form
    69/103.49 = 40.15/x
  3. Step 3: Cross multiply
    69x = 103.49 × 40.15
  4. Step 4: Simplify right side
    69x = 4,155.12
  5. Step 5: Solve for x
    x = 4,155.12/69
  6. Step 6: Final answer
    x = 60.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.