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Finding the Fourth Proportional to 679.70, 937.87 and 399.88

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Solution

The fourth proportional to 679.70, 937.87 and 399.88 is: 551.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.70 : 937.87 = 399.88 : x
  2. Step 2: Convert to fraction form
    679.70/937.87 = 399.88/x
  3. Step 3: Cross multiply
    679.70x = 937.87 × 399.88
  4. Step 4: Simplify right side
    679.70x = 375,035.46
  5. Step 5: Solve for x
    x = 375,035.46/679.70
  6. Step 6: Final answer
    x = 551.77

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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.