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Finding the Fourth Proportional to 681.15, 939.97 and 386.43

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Solution

The fourth proportional to 681.15, 939.97 and 386.43 is: 533.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.15 : 939.97 = 386.43 : x
  2. Step 2: Convert to fraction form
    681.15/939.97 = 386.43/x
  3. Step 3: Cross multiply
    681.15x = 939.97 × 386.43
  4. Step 4: Simplify right side
    681.15x = 363,233.09
  5. Step 5: Solve for x
    x = 363,233.09/681.15
  6. Step 6: Final answer
    x = 533.27

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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.