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Finding the Fourth Proportional to 871.20, 1,299.96 and 727.20

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Solution

The fourth proportional to 871.20, 1,299.96 and 727.20 is: 1,085.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.20 : 1,299.96 = 727.20 : x
  2. Step 2: Convert to fraction form
    871.20/1,299.96 = 727.20/x
  3. Step 3: Cross multiply
    871.20x = 1,299.96 × 727.20
  4. Step 4: Simplify right side
    871.20x = 945,330.91
  5. Step 5: Solve for x
    x = 945,330.91/871.20
  6. Step 6: Final answer
    x = 1,085.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.