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Finding the Fourth Proportional to 681.77, 940.10 and 515.68

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Solution

The fourth proportional to 681.77, 940.10 and 515.68 is: 711.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.77 : 940.10 = 515.68 : x
  2. Step 2: Convert to fraction form
    681.77/940.10 = 515.68/x
  3. Step 3: Cross multiply
    681.77x = 940.10 × 515.68
  4. Step 4: Simplify right side
    681.77x = 484,785.84
  5. Step 5: Solve for x
    x = 484,785.84/681.77
  6. Step 6: Final answer
    x = 711.07

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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.