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Finding the Fourth Proportional to 679.86, 938.25 and 385.02

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Solution

The fourth proportional to 679.86, 938.25 and 385.02 is: 531.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.86 : 938.25 = 385.02 : x
  2. Step 2: Convert to fraction form
    679.86/938.25 = 385.02/x
  3. Step 3: Cross multiply
    679.86x = 938.25 × 385.02
  4. Step 4: Simplify right side
    679.86x = 361,245.02
  5. Step 5: Solve for x
    x = 361,245.02/679.86
  6. Step 6: Final answer
    x = 531.35

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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.