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Finding the Fourth Proportional to 679.17, 937.09 and 399.38

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Solution

The fourth proportional to 679.17, 937.09 and 399.38 is: 551.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.17 : 937.09 = 399.38 : x
  2. Step 2: Convert to fraction form
    679.17/937.09 = 399.38/x
  3. Step 3: Cross multiply
    679.17x = 937.09 × 399.38
  4. Step 4: Simplify right side
    679.17x = 374,256.35
  5. Step 5: Solve for x
    x = 374,256.35/679.17
  6. Step 6: Final answer
    x = 551.05

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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.