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Finding the Fourth Proportional to 1,291.27, 1,781.37 and 871.49

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Solution

The fourth proportional to 1,291.27, 1,781.37 and 871.49 is: 1,202.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.27 : 1,781.37 = 871.49 : x
  2. Step 2: Convert to fraction form
    1,291.27/1,781.37 = 871.49/x
  3. Step 3: Cross multiply
    1,291.27x = 1,781.37 × 871.49
  4. Step 4: Simplify right side
    1,291.27x = 1,552,446.14
  5. Step 5: Solve for x
    x = 1,552,446.14/1,291.27
  6. Step 6: Final answer
    x = 1,202.27

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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.