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Finding the Fourth Proportional to 680.06, 938.61 and 385.34

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Solution

The fourth proportional to 680.06, 938.61 and 385.34 is: 531.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.06 : 938.61 = 385.34 : x
  2. Step 2: Convert to fraction form
    680.06/938.61 = 385.34/x
  3. Step 3: Cross multiply
    680.06x = 938.61 × 385.34
  4. Step 4: Simplify right side
    680.06x = 361,679.28
  5. Step 5: Solve for x
    x = 361,679.28/680.06
  6. Step 6: Final answer
    x = 531.83

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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.