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Finding the Fourth Proportional to 681.58, 940.61 and 515.51

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Solution

The fourth proportional to 681.58, 940.61 and 515.51 is: 711.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.58 : 940.61 = 515.51 : x
  2. Step 2: Convert to fraction form
    681.58/940.61 = 515.51/x
  3. Step 3: Cross multiply
    681.58x = 940.61 × 515.51
  4. Step 4: Simplify right side
    681.58x = 484,890.45
  5. Step 5: Solve for x
    x = 484,890.45/681.58
  6. Step 6: Final answer
    x = 711.42

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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.