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Finding the Fourth Proportional to 1,249.78, 1,724.08 and 808.06

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Solution

The fourth proportional to 1,249.78, 1,724.08 and 808.06 is: 1,114.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.78 : 1,724.08 = 808.06 : x
  2. Step 2: Convert to fraction form
    1,249.78/1,724.08 = 808.06/x
  3. Step 3: Cross multiply
    1,249.78x = 1,724.08 × 808.06
  4. Step 4: Simplify right side
    1,249.78x = 1,393,149.44
  5. Step 5: Solve for x
    x = 1,393,149.44/1,249.78
  6. Step 6: Final answer
    x = 1,114.72

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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.