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Finding the Fourth Proportional to 1,431.20, 1,974.47 and 871.22

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Solution

The fourth proportional to 1,431.20, 1,974.47 and 871.22 is: 1,201.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.20 : 1,974.47 = 871.22 : x
  2. Step 2: Convert to fraction form
    1,431.20/1,974.47 = 871.22/x
  3. Step 3: Cross multiply
    1,431.20x = 1,974.47 × 871.22
  4. Step 4: Simplify right side
    1,431.20x = 1,720,183.52
  5. Step 5: Solve for x
    x = 1,720,183.52/1,431.20
  6. Step 6: Final answer
    x = 1,201.92

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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.