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Finding the Fourth Proportional to 679.75, 938.01 and 399.94

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Solution

The fourth proportional to 679.75, 938.01 and 399.94 is: 551.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.75 : 938.01 = 399.94 : x
  2. Step 2: Convert to fraction form
    679.75/938.01 = 399.94/x
  3. Step 3: Cross multiply
    679.75x = 938.01 × 399.94
  4. Step 4: Simplify right side
    679.75x = 375,149.44
  5. Step 5: Solve for x
    x = 375,149.44/679.75
  6. Step 6: Final answer
    x = 551.89

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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.