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Finding the Fourth Proportional to 838.38, 1,156.90 and 489

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Solution

The fourth proportional to 838.38, 1,156.90 and 489 is: 674.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.38 : 1,156.90 = 489 : x
  2. Step 2: Convert to fraction form
    838.38/1,156.90 = 489/x
  3. Step 3: Cross multiply
    838.38x = 1,156.90 × 489
  4. Step 4: Simplify right side
    838.38x = 565,724.10
  5. Step 5: Solve for x
    x = 565,724.10/838.38
  6. Step 6: Final answer
    x = 674.78

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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.