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Finding the Fourth Proportional to 69.17, 103.61 and 40.21

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Solution

The fourth proportional to 69.17, 103.61 and 40.21 is: 60.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.17 : 103.61 = 40.21 : x
  2. Step 2: Convert to fraction form
    69.17/103.61 = 40.21/x
  3. Step 3: Cross multiply
    69.17x = 103.61 × 40.21
  4. Step 4: Simplify right side
    69.17x = 4,165.74
  5. Step 5: Solve for x
    x = 4,165.74/69.17
  6. Step 6: Final answer
    x = 60.23

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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.