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Finding the Fourth Proportional to 820.59, 1,132.33 and 489.10

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Solution

The fourth proportional to 820.59, 1,132.33 and 489.10 is: 674.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.59 : 1,132.33 = 489.10 : x
  2. Step 2: Convert to fraction form
    820.59/1,132.33 = 489.10/x
  3. Step 3: Cross multiply
    820.59x = 1,132.33 × 489.10
  4. Step 4: Simplify right side
    820.59x = 553,822.60
  5. Step 5: Solve for x
    x = 553,822.60/820.59
  6. Step 6: Final answer
    x = 674.91

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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.