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Finding the Fourth Proportional to 199.28, 298.94 and 77.70

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Solution

The fourth proportional to 199.28, 298.94 and 77.70 is: 116.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.28 : 298.94 = 77.70 : x
  2. Step 2: Convert to fraction form
    199.28/298.94 = 77.70/x
  3. Step 3: Cross multiply
    199.28x = 298.94 × 77.70
  4. Step 4: Simplify right side
    199.28x = 23,227.25
  5. Step 5: Solve for x
    x = 23,227.25/199.28
  6. Step 6: Final answer
    x = 116.56

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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.