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Finding the Fourth Proportional to 871.28, 1,306.32 and 578.36

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Solution

The fourth proportional to 871.28, 1,306.32 and 578.36 is: 867.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.28 : 1,306.32 = 578.36 : x
  2. Step 2: Convert to fraction form
    871.28/1,306.32 = 578.36/x
  3. Step 3: Cross multiply
    871.28x = 1,306.32 × 578.36
  4. Step 4: Simplify right side
    871.28x = 755,523.24
  5. Step 5: Solve for x
    x = 755,523.24/871.28
  6. Step 6: Final answer
    x = 867.14

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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.