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Finding the Fourth Proportional to 680.07, 938.45 and 400.49

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Solution

The fourth proportional to 680.07, 938.45 and 400.49 is: 552.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.07 : 938.45 = 400.49 : x
  2. Step 2: Convert to fraction form
    680.07/938.45 = 400.49/x
  3. Step 3: Cross multiply
    680.07x = 938.45 × 400.49
  4. Step 4: Simplify right side
    680.07x = 375,839.84
  5. Step 5: Solve for x
    x = 375,839.84/680.07
  6. Step 6: Final answer
    x = 552.65

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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.