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Finding the Fourth Proportional to 1,791.29, 2,686.93 and 816.25

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Solution

The fourth proportional to 1,791.29, 2,686.93 and 816.25 is: 1,224.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.29 : 2,686.93 = 816.25 : x
  2. Step 2: Convert to fraction form
    1,791.29/2,686.93 = 816.25/x
  3. Step 3: Cross multiply
    1,791.29x = 2,686.93 × 816.25
  4. Step 4: Simplify right side
    1,791.29x = 2,193,197.85
  5. Step 5: Solve for x
    x = 2,193,197.85/1,791.29
  6. Step 6: Final answer
    x = 1,224.37

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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.