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Finding the Fourth Proportional to 1,039.74, 1,557.33 and 806.79

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Solution

The fourth proportional to 1,039.74, 1,557.33 and 806.79 is: 1,208.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.74 : 1,557.33 = 806.79 : x
  2. Step 2: Convert to fraction form
    1,039.74/1,557.33 = 806.79/x
  3. Step 3: Cross multiply
    1,039.74x = 1,557.33 × 806.79
  4. Step 4: Simplify right side
    1,039.74x = 1,256,441.09
  5. Step 5: Solve for x
    x = 1,256,441.09/1,039.74
  6. Step 6: Final answer
    x = 1,208.42

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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.