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Finding the Fourth Proportional to 1,479, 2,219.36 and 820.97

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Solution

The fourth proportional to 1,479, 2,219.36 and 820.97 is: 1,231.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479 : 2,219.36 = 820.97 : x
  2. Step 2: Convert to fraction form
    1,479/2,219.36 = 820.97/x
  3. Step 3: Cross multiply
    1,479x = 2,219.36 × 820.97
  4. Step 4: Simplify right side
    1,479x = 1,822,012.78
  5. Step 5: Solve for x
    x = 1,822,012.78/1,479
  6. Step 6: Final answer
    x = 1,231.92

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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.