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Finding the Fourth Proportional to 549.12, 822.64 and 426.78

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Solution

The fourth proportional to 549.12, 822.64 and 426.78 is: 639.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.12 : 822.64 = 426.78 : x
  2. Step 2: Convert to fraction form
    549.12/822.64 = 426.78/x
  3. Step 3: Cross multiply
    549.12x = 822.64 × 426.78
  4. Step 4: Simplify right side
    549.12x = 351,087.29
  5. Step 5: Solve for x
    x = 351,087.29/549.12
  6. Step 6: Final answer
    x = 639.37

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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.