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Finding the Fourth Proportional to 871.91, 1,201.03 and 814.51

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Solution

The fourth proportional to 871.91, 1,201.03 and 814.51 is: 1,121.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.91 : 1,201.03 = 814.51 : x
  2. Step 2: Convert to fraction form
    871.91/1,201.03 = 814.51/x
  3. Step 3: Cross multiply
    871.91x = 1,201.03 × 814.51
  4. Step 4: Simplify right side
    871.91x = 978,243.65
  5. Step 5: Solve for x
    x = 978,243.65/871.91
  6. Step 6: Final answer
    x = 1,121.95

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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.