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Finding the Fourth Proportional to 1,011.87, 1,394.91 and 871.38

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Solution

The fourth proportional to 1,011.87, 1,394.91 and 871.38 is: 1,201.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.87 : 1,394.91 = 871.38 : x
  2. Step 2: Convert to fraction form
    1,011.87/1,394.91 = 871.38/x
  3. Step 3: Cross multiply
    1,011.87x = 1,394.91 × 871.38
  4. Step 4: Simplify right side
    1,011.87x = 1,215,496.68
  5. Step 5: Solve for x
    x = 1,215,496.68/1,011.87
  6. Step 6: Final answer
    x = 1,201.24

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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.