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Finding the Fourth Proportional to 871.34, 1,201.91 and 672.21

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Solution

The fourth proportional to 871.34, 1,201.91 and 672.21 is: 927.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.34 : 1,201.91 = 672.21 : x
  2. Step 2: Convert to fraction form
    871.34/1,201.91 = 672.21/x
  3. Step 3: Cross multiply
    871.34x = 1,201.91 × 672.21
  4. Step 4: Simplify right side
    871.34x = 807,932.56
  5. Step 5: Solve for x
    x = 807,932.56/871.34
  6. Step 6: Final answer
    x = 927.24

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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.