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Finding the Fourth Proportional to 679.75, 937.99 and 399.99

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Solution

The fourth proportional to 679.75, 937.99 and 399.99 is: 551.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.75 : 937.99 = 399.99 : x
  2. Step 2: Convert to fraction form
    679.75/937.99 = 399.99/x
  3. Step 3: Cross multiply
    679.75x = 937.99 × 399.99
  4. Step 4: Simplify right side
    679.75x = 375,186.62
  5. Step 5: Solve for x
    x = 375,186.62/679.75
  6. Step 6: Final answer
    x = 551.95

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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.