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Finding the Fourth Proportional to 1,431, 1,974.29 and 871.29

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Solution

The fourth proportional to 1,431, 1,974.29 and 871.29 is: 1,202.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431 : 1,974.29 = 871.29 : x
  2. Step 2: Convert to fraction form
    1,431/1,974.29 = 871.29/x
  3. Step 3: Cross multiply
    1,431x = 1,974.29 × 871.29
  4. Step 4: Simplify right side
    1,431x = 1,720,174.78
  5. Step 5: Solve for x
    x = 1,720,174.78/1,431
  6. Step 6: Final answer
    x = 1,202.08

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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.