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Finding the Fourth Proportional to 681.27, 940.17 and 386.57

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Solution

The fourth proportional to 681.27, 940.17 and 386.57 is: 533.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.27 : 940.17 = 386.57 : x
  2. Step 2: Convert to fraction form
    681.27/940.17 = 386.57/x
  3. Step 3: Cross multiply
    681.27x = 940.17 × 386.57
  4. Step 4: Simplify right side
    681.27x = 363,436.82
  5. Step 5: Solve for x
    x = 363,436.82/681.27
  6. Step 6: Final answer
    x = 533.47

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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.