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Finding the Fourth Proportional to 679.43, 937.55 and 399.66

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Solution

The fourth proportional to 679.43, 937.55 and 399.66 is: 551.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.43 : 937.55 = 399.66 : x
  2. Step 2: Convert to fraction form
    679.43/937.55 = 399.66/x
  3. Step 3: Cross multiply
    679.43x = 937.55 × 399.66
  4. Step 4: Simplify right side
    679.43x = 374,699.23
  5. Step 5: Solve for x
    x = 374,699.23/679.43
  6. Step 6: Final answer
    x = 551.49

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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.