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Finding the Fourth Proportional to 679.88, 937.92 and 400

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Solution

The fourth proportional to 679.88, 937.92 and 400 is: 551.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.88 : 937.92 = 400 : x
  2. Step 2: Convert to fraction form
    679.88/937.92 = 400/x
  3. Step 3: Cross multiply
    679.88x = 937.92 × 400
  4. Step 4: Simplify right side
    679.88x = 375,168
  5. Step 5: Solve for x
    x = 375,168/679.88
  6. Step 6: Final answer
    x = 551.82

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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.