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Finding the Fourth Proportional to 640.80, 961.07 and 224.28

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Solution

The fourth proportional to 640.80, 961.07 and 224.28 is: 336.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.80 : 961.07 = 224.28 : x
  2. Step 2: Convert to fraction form
    640.80/961.07 = 224.28/x
  3. Step 3: Cross multiply
    640.80x = 961.07 × 224.28
  4. Step 4: Simplify right side
    640.80x = 215,547.66
  5. Step 5: Solve for x
    x = 215,547.66/640.80
  6. Step 6: Final answer
    x = 336.37

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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.