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Finding the Fourth Proportional to 681.11, 939.94 and 386.44

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Solution

The fourth proportional to 681.11, 939.94 and 386.44 is: 533.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.11 : 939.94 = 386.44 : x
  2. Step 2: Convert to fraction form
    681.11/939.94 = 386.44/x
  3. Step 3: Cross multiply
    681.11x = 939.94 × 386.44
  4. Step 4: Simplify right side
    681.11x = 363,227.10
  5. Step 5: Solve for x
    x = 363,227.10/681.11
  6. Step 6: Final answer
    x = 533.29

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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.