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Finding the Fourth Proportional to 799.68, 1,103.40 and 489

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Solution

The fourth proportional to 799.68, 1,103.40 and 489 is: 674.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.68 : 1,103.40 = 489 : x
  2. Step 2: Convert to fraction form
    799.68/1,103.40 = 489/x
  3. Step 3: Cross multiply
    799.68x = 1,103.40 × 489
  4. Step 4: Simplify right side
    799.68x = 539,562.60
  5. Step 5: Solve for x
    x = 539,562.60/799.68
  6. Step 6: Final answer
    x = 674.72

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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.