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Finding the Fourth Proportional to 640.17, 959.78 and 351.69

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Solution

The fourth proportional to 640.17, 959.78 and 351.69 is: 527.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.17 : 959.78 = 351.69 : x
  2. Step 2: Convert to fraction form
    640.17/959.78 = 351.69/x
  3. Step 3: Cross multiply
    640.17x = 959.78 × 351.69
  4. Step 4: Simplify right side
    640.17x = 337,543.27
  5. Step 5: Solve for x
    x = 337,543.27/640.17
  6. Step 6: Final answer
    x = 527.27

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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.