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Finding the Fourth Proportional to 1,791.36, 2,687.31 and 817.47

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Solution

The fourth proportional to 1,791.36, 2,687.31 and 817.47 is: 1,226.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.36 : 2,687.31 = 817.47 : x
  2. Step 2: Convert to fraction form
    1,791.36/2,687.31 = 817.47/x
  3. Step 3: Cross multiply
    1,791.36x = 2,687.31 × 817.47
  4. Step 4: Simplify right side
    1,791.36x = 2,196,795.31
  5. Step 5: Solve for x
    x = 2,196,795.31/1,791.36
  6. Step 6: Final answer
    x = 1,226.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.