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Finding the Fourth Proportional to 680, 938.56 and 400.25

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Solution

The fourth proportional to 680, 938.56 and 400.25 is: 552.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    680 : 938.56 = 400.25 : x
  2. Step 2: Convert to fraction form
    680/938.56 = 400.25/x
  3. Step 3: Cross multiply
    680x = 938.56 × 400.25
  4. Step 4: Simplify right side
    680x = 375,658.64
  5. Step 5: Solve for x
    x = 375,658.64/680
  6. Step 6: Final answer
    x = 552.44

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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.