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Finding the Fourth Proportional to 3,179.76, 4,769.76 and 871.28

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Solution

The fourth proportional to 3,179.76, 4,769.76 and 871.28 is: 1,306.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,179.76 : 4,769.76 = 871.28 : x
  2. Step 2: Convert to fraction form
    3,179.76/4,769.76 = 871.28/x
  3. Step 3: Cross multiply
    3,179.76x = 4,769.76 × 871.28
  4. Step 4: Simplify right side
    3,179.76x = 4,155,796.49
  5. Step 5: Solve for x
    x = 4,155,796.49/3,179.76
  6. Step 6: Final answer
    x = 1,306.95

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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.