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Finding the Fourth Proportional to 1,431.08, 1,974.47 and 871.23

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Solution

The fourth proportional to 1,431.08, 1,974.47 and 871.23 is: 1,202.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.08 : 1,974.47 = 871.23 : x
  2. Step 2: Convert to fraction form
    1,431.08/1,974.47 = 871.23/x
  3. Step 3: Cross multiply
    1,431.08x = 1,974.47 × 871.23
  4. Step 4: Simplify right side
    1,431.08x = 1,720,213.14
  5. Step 5: Solve for x
    x = 1,720,213.14/1,431.08
  6. Step 6: Final answer
    x = 1,202.04

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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.