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Finding the Fourth Proportional to 638.17, 880.97 and 428.49

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Solution

The fourth proportional to 638.17, 880.97 and 428.49 is: 591.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.17 : 880.97 = 428.49 : x
  2. Step 2: Convert to fraction form
    638.17/880.97 = 428.49/x
  3. Step 3: Cross multiply
    638.17x = 880.97 × 428.49
  4. Step 4: Simplify right side
    638.17x = 377,484.69
  5. Step 5: Solve for x
    x = 377,484.69/638.17
  6. Step 6: Final answer
    x = 591.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.