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Finding the Fourth Proportional to 549.97, 824.50 and 428.78

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Solution

The fourth proportional to 549.97, 824.50 and 428.78 is: 642.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.97 : 824.50 = 428.78 : x
  2. Step 2: Convert to fraction form
    549.97/824.50 = 428.78/x
  3. Step 3: Cross multiply
    549.97x = 824.50 × 428.78
  4. Step 4: Simplify right side
    549.97x = 353,529.11
  5. Step 5: Solve for x
    x = 353,529.11/549.97
  6. Step 6: Final answer
    x = 642.82

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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.