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Finding the Fourth Proportional to 679.99, 938.33 and 385.20

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Solution

The fourth proportional to 679.99, 938.33 and 385.20 is: 531.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.99 : 938.33 = 385.20 : x
  2. Step 2: Convert to fraction form
    679.99/938.33 = 385.20/x
  3. Step 3: Cross multiply
    679.99x = 938.33 × 385.20
  4. Step 4: Simplify right side
    679.99x = 361,444.72
  5. Step 5: Solve for x
    x = 361,444.72/679.99
  6. Step 6: Final answer
    x = 531.54

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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.