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Finding the Fourth Proportional to 2,690.88, 3,713.82 and 1,643.54

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Solution

The fourth proportional to 2,690.88, 3,713.82 and 1,643.54 is: 2,268.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.88 : 3,713.82 = 1,643.54 : x
  2. Step 2: Convert to fraction form
    2,690.88/3,713.82 = 1,643.54/x
  3. Step 3: Cross multiply
    2,690.88x = 3,713.82 × 1,643.54
  4. Step 4: Simplify right side
    2,690.88x = 6,103,811.72
  5. Step 5: Solve for x
    x = 6,103,811.72/2,690.88
  6. Step 6: Final answer
    x = 2,268.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.