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Finding the Fourth Proportional to 839.22, 1,257.18 and 549.78

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Solution

The fourth proportional to 839.22, 1,257.18 and 549.78 is: 823.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.22 : 1,257.18 = 549.78 : x
  2. Step 2: Convert to fraction form
    839.22/1,257.18 = 549.78/x
  3. Step 3: Cross multiply
    839.22x = 1,257.18 × 549.78
  4. Step 4: Simplify right side
    839.22x = 691,172.42
  5. Step 5: Solve for x
    x = 691,172.42/839.22
  6. Step 6: Final answer
    x = 823.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.