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Finding the Fourth Proportional to 679.42, 937.76 and 399.67

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Solution

The fourth proportional to 679.42, 937.76 and 399.67 is: 551.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.42 : 937.76 = 399.67 : x
  2. Step 2: Convert to fraction form
    679.42/937.76 = 399.67/x
  3. Step 3: Cross multiply
    679.42x = 937.76 × 399.67
  4. Step 4: Simplify right side
    679.42x = 374,794.54
  5. Step 5: Solve for x
    x = 374,794.54/679.42
  6. Step 6: Final answer
    x = 551.64

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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.