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Finding the Fourth Proportional to 142.16, 213.12 and 81.44

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Solution

The fourth proportional to 142.16, 213.12 and 81.44 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.16 : 213.12 = 81.44 : x
  2. Step 2: Convert to fraction form
    142.16/213.12 = 81.44/x
  3. Step 3: Cross multiply
    142.16x = 213.12 × 81.44
  4. Step 4: Simplify right side
    142.16x = 17,356.49
  5. Step 5: Solve for x
    x = 17,356.49/142.16
  6. Step 6: Final answer
    x = 122.09

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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.