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Finding the Fourth Proportional to 817.26, 1,218.99 and 685.72

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Solution

The fourth proportional to 817.26, 1,218.99 and 685.72 is: 1,022.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.26 : 1,218.99 = 685.72 : x
  2. Step 2: Convert to fraction form
    817.26/1,218.99 = 685.72/x
  3. Step 3: Cross multiply
    817.26x = 1,218.99 × 685.72
  4. Step 4: Simplify right side
    817.26x = 835,885.82
  5. Step 5: Solve for x
    x = 835,885.82/817.26
  6. Step 6: Final answer
    x = 1,022.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.