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Finding the Fourth Proportional to 871.91, 1,304.57 and 519.21

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Solution

The fourth proportional to 871.91, 1,304.57 and 519.21 is: 776.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.91 : 1,304.57 = 519.21 : x
  2. Step 2: Convert to fraction form
    871.91/1,304.57 = 519.21/x
  3. Step 3: Cross multiply
    871.91x = 1,304.57 × 519.21
  4. Step 4: Simplify right side
    871.91x = 677,347.09
  5. Step 5: Solve for x
    x = 677,347.09/871.91
  6. Step 6: Final answer
    x = 776.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.