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Finding the Fourth Proportional to 549.78, 823.41 and 426.30

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Solution

The fourth proportional to 549.78, 823.41 and 426.30 is: 638.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.78 : 823.41 = 426.30 : x
  2. Step 2: Convert to fraction form
    549.78/823.41 = 426.30/x
  3. Step 3: Cross multiply
    549.78x = 823.41 × 426.30
  4. Step 4: Simplify right side
    549.78x = 351,019.68
  5. Step 5: Solve for x
    x = 351,019.68/549.78
  6. Step 6: Final answer
    x = 638.47

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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.