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Finding the Fourth Proportional to 142.43, 213.61 and 69.26

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Solution

The fourth proportional to 142.43, 213.61 and 69.26 is: 103.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.43 : 213.61 = 69.26 : x
  2. Step 2: Convert to fraction form
    142.43/213.61 = 69.26/x
  3. Step 3: Cross multiply
    142.43x = 213.61 × 69.26
  4. Step 4: Simplify right side
    142.43x = 14,794.63
  5. Step 5: Solve for x
    x = 14,794.63/142.43
  6. Step 6: Final answer
    x = 103.87

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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.