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Finding the Fourth Proportional to 876.28, 1,313.56 and 298.80

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Solution

The fourth proportional to 876.28, 1,313.56 and 298.80 is: 447.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.28 : 1,313.56 = 298.80 : x
  2. Step 2: Convert to fraction form
    876.28/1,313.56 = 298.80/x
  3. Step 3: Cross multiply
    876.28x = 1,313.56 × 298.80
  4. Step 4: Simplify right side
    876.28x = 392,491.73
  5. Step 5: Solve for x
    x = 392,491.73/876.28
  6. Step 6: Final answer
    x = 447.91

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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.