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Finding the Fourth Proportional to 640.19, 961.04 and 348.26

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Solution

The fourth proportional to 640.19, 961.04 and 348.26 is: 522.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.19 : 961.04 = 348.26 : x
  2. Step 2: Convert to fraction form
    640.19/961.04 = 348.26/x
  3. Step 3: Cross multiply
    640.19x = 961.04 × 348.26
  4. Step 4: Simplify right side
    640.19x = 334,687.86
  5. Step 5: Solve for x
    x = 334,687.86/640.19
  6. Step 6: Final answer
    x = 522.79

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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.