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Finding the Fourth Proportional to 149.84, 206.28 and 142.96

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Solution

The fourth proportional to 149.84, 206.28 and 142.96 is: 196.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.84 : 206.28 = 142.96 : x
  2. Step 2: Convert to fraction form
    149.84/206.28 = 142.96/x
  3. Step 3: Cross multiply
    149.84x = 206.28 × 142.96
  4. Step 4: Simplify right side
    149.84x = 29,489.79
  5. Step 5: Solve for x
    x = 29,489.79/149.84
  6. Step 6: Final answer
    x = 196.81

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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.