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Finding the Fourth Proportional to 838.31, 1,156.97 and 489

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Solution

The fourth proportional to 838.31, 1,156.97 and 489 is: 674.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.31 : 1,156.97 = 489 : x
  2. Step 2: Convert to fraction form
    838.31/1,156.97 = 489/x
  3. Step 3: Cross multiply
    838.31x = 1,156.97 × 489
  4. Step 4: Simplify right side
    838.31x = 565,758.33
  5. Step 5: Solve for x
    x = 565,758.33/838.31
  6. Step 6: Final answer
    x = 674.88

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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.