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Finding the Fourth Proportional to 882.20, 1,217.48 and 489.21

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Solution

The fourth proportional to 882.20, 1,217.48 and 489.21 is: 675.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.20 : 1,217.48 = 489.21 : x
  2. Step 2: Convert to fraction form
    882.20/1,217.48 = 489.21/x
  3. Step 3: Cross multiply
    882.20x = 1,217.48 × 489.21
  4. Step 4: Simplify right side
    882.20x = 595,600.94
  5. Step 5: Solve for x
    x = 595,600.94/882.20
  6. Step 6: Final answer
    x = 675.14

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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.