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Finding the Fourth Proportional to 1,278.73, 1,764.12 and 806.44

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Solution

The fourth proportional to 1,278.73, 1,764.12 and 806.44 is: 1,112.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.73 : 1,764.12 = 806.44 : x
  2. Step 2: Convert to fraction form
    1,278.73/1,764.12 = 806.44/x
  3. Step 3: Cross multiply
    1,278.73x = 1,764.12 × 806.44
  4. Step 4: Simplify right side
    1,278.73x = 1,422,656.93
  5. Step 5: Solve for x
    x = 1,422,656.93/1,278.73
  6. Step 6: Final answer
    x = 1,112.55

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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.