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Finding the Fourth Proportional to 839.21, 1,158.04 and 489.92

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Solution

The fourth proportional to 839.21, 1,158.04 and 489.92 is: 676.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.21 : 1,158.04 = 489.92 : x
  2. Step 2: Convert to fraction form
    839.21/1,158.04 = 489.92/x
  3. Step 3: Cross multiply
    839.21x = 1,158.04 × 489.92
  4. Step 4: Simplify right side
    839.21x = 567,350.46
  5. Step 5: Solve for x
    x = 567,350.46/839.21
  6. Step 6: Final answer
    x = 676.05

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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.