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Finding the Fourth Proportional to 640.67, 961.34 and 348.38

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Solution

The fourth proportional to 640.67, 961.34 and 348.38 is: 522.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.67 : 961.34 = 348.38 : x
  2. Step 2: Convert to fraction form
    640.67/961.34 = 348.38/x
  3. Step 3: Cross multiply
    640.67x = 961.34 × 348.38
  4. Step 4: Simplify right side
    640.67x = 334,905.08
  5. Step 5: Solve for x
    x = 334,905.08/640.67
  6. Step 6: Final answer
    x = 522.75

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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.