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Finding the Fourth Proportional to 142.68, 196.82 and 90.20

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Solution

The fourth proportional to 142.68, 196.82 and 90.20 is: 124.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.68 : 196.82 = 90.20 : x
  2. Step 2: Convert to fraction form
    142.68/196.82 = 90.20/x
  3. Step 3: Cross multiply
    142.68x = 196.82 × 90.20
  4. Step 4: Simplify right side
    142.68x = 17,753.16
  5. Step 5: Solve for x
    x = 17,753.16/142.68
  6. Step 6: Final answer
    x = 124.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.