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Finding the Fourth Proportional to 1,249.44, 1,724.94 and 808

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Solution

The fourth proportional to 1,249.44, 1,724.94 and 808 is: 1,115.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.44 : 1,724.94 = 808 : x
  2. Step 2: Convert to fraction form
    1,249.44/1,724.94 = 808/x
  3. Step 3: Cross multiply
    1,249.44x = 1,724.94 × 808
  4. Step 4: Simplify right side
    1,249.44x = 1,393,751.52
  5. Step 5: Solve for x
    x = 1,393,751.52/1,249.44
  6. Step 6: Final answer
    x = 1,115.50

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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.