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Finding the Fourth Proportional to 1,337.76, 2,002.80 and 821.28

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Solution

The fourth proportional to 1,337.76, 2,002.80 and 821.28 is: 1,229.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,337.76 : 2,002.80 = 821.28 : x
  2. Step 2: Convert to fraction form
    1,337.76/2,002.80 = 821.28/x
  3. Step 3: Cross multiply
    1,337.76x = 2,002.80 × 821.28
  4. Step 4: Simplify right side
    1,337.76x = 1,644,859.58
  5. Step 5: Solve for x
    x = 1,644,859.58/1,337.76
  6. Step 6: Final answer
    x = 1,229.56

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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.