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Finding the Fourth Proportional to 199.28, 298.42 and 158.78

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Solution

The fourth proportional to 199.28, 298.42 and 158.78 is: 237.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.28 : 298.42 = 158.78 : x
  2. Step 2: Convert to fraction form
    199.28/298.42 = 158.78/x
  3. Step 3: Cross multiply
    199.28x = 298.42 × 158.78
  4. Step 4: Simplify right side
    199.28x = 47,383.48
  5. Step 5: Solve for x
    x = 47,383.48/199.28
  6. Step 6: Final answer
    x = 237.77

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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.