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Finding the Fourth Proportional to 638.35, 956.71 and 349.45

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Solution

The fourth proportional to 638.35, 956.71 and 349.45 is: 523.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.35 : 956.71 = 349.45 : x
  2. Step 2: Convert to fraction form
    638.35/956.71 = 349.45/x
  3. Step 3: Cross multiply
    638.35x = 956.71 × 349.45
  4. Step 4: Simplify right side
    638.35x = 334,320.35
  5. Step 5: Solve for x
    x = 334,320.35/638.35
  6. Step 6: Final answer
    x = 523.73

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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.