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Finding the Fourth Proportional to 882.40, 1,217.72 and 489.43

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Solution

The fourth proportional to 882.40, 1,217.72 and 489.43 is: 675.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.40 : 1,217.72 = 489.43 : x
  2. Step 2: Convert to fraction form
    882.40/1,217.72 = 489.43/x
  3. Step 3: Cross multiply
    882.40x = 1,217.72 × 489.43
  4. Step 4: Simplify right side
    882.40x = 595,988.70
  5. Step 5: Solve for x
    x = 595,988.70/882.40
  6. Step 6: Final answer
    x = 675.42

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1.5x scale

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.