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Finding the Fourth Proportional to 549.05, 822.76 and 427.55

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Solution

The fourth proportional to 549.05, 822.76 and 427.55 is: 640.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.05 : 822.76 = 427.55 : x
  2. Step 2: Convert to fraction form
    549.05/822.76 = 427.55/x
  3. Step 3: Cross multiply
    549.05x = 822.76 × 427.55
  4. Step 4: Simplify right side
    549.05x = 351,765.86
  5. Step 5: Solve for x
    x = 351,765.86/549.05
  6. Step 6: Final answer
    x = 640.69

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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.