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Finding the Fourth Proportional to 681.56, 940.62 and 386.84

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Solution

The fourth proportional to 681.56, 940.62 and 386.84 is: 533.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.56 : 940.62 = 386.84 : x
  2. Step 2: Convert to fraction form
    681.56/940.62 = 386.84/x
  3. Step 3: Cross multiply
    681.56x = 940.62 × 386.84
  4. Step 4: Simplify right side
    681.56x = 363,869.44
  5. Step 5: Solve for x
    x = 363,869.44/681.56
  6. Step 6: Final answer
    x = 533.88

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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.