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Finding the Fourth Proportional to 839.26, 1,158.06 and 489.88

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Solution

The fourth proportional to 839.26, 1,158.06 and 489.88 is: 675.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.26 : 1,158.06 = 489.88 : x
  2. Step 2: Convert to fraction form
    839.26/1,158.06 = 489.88/x
  3. Step 3: Cross multiply
    839.26x = 1,158.06 × 489.88
  4. Step 4: Simplify right side
    839.26x = 567,310.43
  5. Step 5: Solve for x
    x = 567,310.43/839.26
  6. Step 6: Final answer
    x = 675.97

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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.