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Finding the Fourth Proportional to 680.65, 938.96 and 400.71

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Solution

The fourth proportional to 680.65, 938.96 and 400.71 is: 552.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.65 : 938.96 = 400.71 : x
  2. Step 2: Convert to fraction form
    680.65/938.96 = 400.71/x
  3. Step 3: Cross multiply
    680.65x = 938.96 × 400.71
  4. Step 4: Simplify right side
    680.65x = 376,250.66
  5. Step 5: Solve for x
    x = 376,250.66/680.65
  6. Step 6: Final answer
    x = 552.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.