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Finding the Fourth Proportional to 1,791.12, 2,686.96 and 818.16

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Solution

The fourth proportional to 1,791.12, 2,686.96 and 818.16 is: 1,227.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.12 : 2,686.96 = 818.16 : x
  2. Step 2: Convert to fraction form
    1,791.12/2,686.96 = 818.16/x
  3. Step 3: Cross multiply
    1,791.12x = 2,686.96 × 818.16
  4. Step 4: Simplify right side
    1,791.12x = 2,198,363.19
  5. Step 5: Solve for x
    x = 2,198,363.19/1,791.12
  6. Step 6: Final answer
    x = 1,227.37

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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.