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Finding the Fourth Proportional to 679.89, 938.13 and 385.17

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Solution

The fourth proportional to 679.89, 938.13 and 385.17 is: 531.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.89 : 938.13 = 385.17 : x
  2. Step 2: Convert to fraction form
    679.89/938.13 = 385.17/x
  3. Step 3: Cross multiply
    679.89x = 938.13 × 385.17
  4. Step 4: Simplify right side
    679.89x = 361,339.53
  5. Step 5: Solve for x
    x = 361,339.53/679.89
  6. Step 6: Final answer
    x = 531.47

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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.