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Finding the Fourth Proportional to 681.28, 940.44 and 515.53

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Solution

The fourth proportional to 681.28, 940.44 and 515.53 is: 711.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.28 : 940.44 = 515.53 : x
  2. Step 2: Convert to fraction form
    681.28/940.44 = 515.53/x
  3. Step 3: Cross multiply
    681.28x = 940.44 × 515.53
  4. Step 4: Simplify right side
    681.28x = 484,825.03
  5. Step 5: Solve for x
    x = 484,825.03/681.28
  6. Step 6: Final answer
    x = 711.64

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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.