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Finding the Fourth Proportional to 142.10, 213.20 and 84.43

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Solution

The fourth proportional to 142.10, 213.20 and 84.43 is: 126.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.10 : 213.20 = 84.43 : x
  2. Step 2: Convert to fraction form
    142.10/213.20 = 84.43/x
  3. Step 3: Cross multiply
    142.10x = 213.20 × 84.43
  4. Step 4: Simplify right side
    142.10x = 18,000.15
  5. Step 5: Solve for x
    x = 18,000.15/142.10
  6. Step 6: Final answer
    x = 126.68

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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.