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Finding the Fourth Proportional to 2,169.78, 3,254.40 and 871.26

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Solution

The fourth proportional to 2,169.78, 3,254.40 and 871.26 is: 1,306.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.78 : 3,254.40 = 871.26 : x
  2. Step 2: Convert to fraction form
    2,169.78/3,254.40 = 871.26/x
  3. Step 3: Cross multiply
    2,169.78x = 3,254.40 × 871.26
  4. Step 4: Simplify right side
    2,169.78x = 2,835,428.54
  5. Step 5: Solve for x
    x = 2,835,428.54/2,169.78
  6. Step 6: Final answer
    x = 1,306.78

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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.