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Finding the Fourth Proportional to 679.34, 937.61 and 399.52

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Solution

The fourth proportional to 679.34, 937.61 and 399.52 is: 551.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.34 : 937.61 = 399.52 : x
  2. Step 2: Convert to fraction form
    679.34/937.61 = 399.52/x
  3. Step 3: Cross multiply
    679.34x = 937.61 × 399.52
  4. Step 4: Simplify right side
    679.34x = 374,593.95
  5. Step 5: Solve for x
    x = 374,593.95/679.34
  6. Step 6: Final answer
    x = 551.41

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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.