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Finding the Fourth Proportional to 1,791.28, 2,686.38 and 695.80

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Solution

The fourth proportional to 1,791.28, 2,686.38 and 695.80 is: 1,043.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.28 : 2,686.38 = 695.80 : x
  2. Step 2: Convert to fraction form
    1,791.28/2,686.38 = 695.80/x
  3. Step 3: Cross multiply
    1,791.28x = 2,686.38 × 695.80
  4. Step 4: Simplify right side
    1,791.28x = 1,869,183.20
  5. Step 5: Solve for x
    x = 1,869,183.20/1,791.28
  6. Step 6: Final answer
    x = 1,043.49

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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.