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Finding the Fourth Proportional to 1,791.40, 2,686.78 and 817.26

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Solution

The fourth proportional to 1,791.40, 2,686.78 and 817.26 is: 1,225.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.40 : 2,686.78 = 817.26 : x
  2. Step 2: Convert to fraction form
    1,791.40/2,686.78 = 817.26/x
  3. Step 3: Cross multiply
    1,791.40x = 2,686.78 × 817.26
  4. Step 4: Simplify right side
    1,791.40x = 2,195,797.82
  5. Step 5: Solve for x
    x = 2,195,797.82/1,791.40
  6. Step 6: Final answer
    x = 1,225.74

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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.