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Finding the Fourth Proportional to 1,265.39, 1,747.28 and 871.73

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Solution

The fourth proportional to 1,265.39, 1,747.28 and 871.73 is: 1,203.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.39 : 1,747.28 = 871.73 : x
  2. Step 2: Convert to fraction form
    1,265.39/1,747.28 = 871.73/x
  3. Step 3: Cross multiply
    1,265.39x = 1,747.28 × 871.73
  4. Step 4: Simplify right side
    1,265.39x = 1,523,152.04
  5. Step 5: Solve for x
    x = 1,523,152.04/1,265.39
  6. Step 6: Final answer
    x = 1,203.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.