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Finding the Fourth Proportional to 1,278.31, 1,763.56 and 806.08

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Solution

The fourth proportional to 1,278.31, 1,763.56 and 806.08 is: 1,112.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.31 : 1,763.56 = 806.08 : x
  2. Step 2: Convert to fraction form
    1,278.31/1,763.56 = 806.08/x
  3. Step 3: Cross multiply
    1,278.31x = 1,763.56 × 806.08
  4. Step 4: Simplify right side
    1,278.31x = 1,421,570.44
  5. Step 5: Solve for x
    x = 1,421,570.44/1,278.31
  6. Step 6: Final answer
    x = 1,112.07

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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.