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Finding the Fourth Proportional to 680.37, 938.66 and 385.42

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Solution

The fourth proportional to 680.37, 938.66 and 385.42 is: 531.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.37 : 938.66 = 385.42 : x
  2. Step 2: Convert to fraction form
    680.37/938.66 = 385.42/x
  3. Step 3: Cross multiply
    680.37x = 938.66 × 385.42
  4. Step 4: Simplify right side
    680.37x = 361,778.34
  5. Step 5: Solve for x
    x = 361,778.34/680.37
  6. Step 6: Final answer
    x = 531.74

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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.