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Finding the Fourth Proportional to 142.96, 196.89 and 136.48

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Solution

The fourth proportional to 142.96, 196.89 and 136.48 is: 187.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.96 : 196.89 = 136.48 : x
  2. Step 2: Convert to fraction form
    142.96/196.89 = 136.48/x
  3. Step 3: Cross multiply
    142.96x = 196.89 × 136.48
  4. Step 4: Simplify right side
    142.96x = 26,871.55
  5. Step 5: Solve for x
    x = 26,871.55/142.96
  6. Step 6: Final answer
    x = 187.97

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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.