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Finding the Fourth Proportional to 882.12, 1,217.12 and 489.08

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Solution

The fourth proportional to 882.12, 1,217.12 and 489.08 is: 674.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.12 : 1,217.12 = 489.08 : x
  2. Step 2: Convert to fraction form
    882.12/1,217.12 = 489.08/x
  3. Step 3: Cross multiply
    882.12x = 1,217.12 × 489.08
  4. Step 4: Simplify right side
    882.12x = 595,269.05
  5. Step 5: Solve for x
    x = 595,269.05/882.12
  6. Step 6: Final answer
    x = 674.82

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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.