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Finding the Fourth Proportional to 1,249.08, 1,722.42 and 1,072.68

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Solution

The fourth proportional to 1,249.08, 1,722.42 and 1,072.68 is: 1,479.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.08 : 1,722.42 = 1,072.68 : x
  2. Step 2: Convert to fraction form
    1,249.08/1,722.42 = 1,072.68/x
  3. Step 3: Cross multiply
    1,249.08x = 1,722.42 × 1,072.68
  4. Step 4: Simplify right side
    1,249.08x = 1,847,605.49
  5. Step 5: Solve for x
    x = 1,847,605.49/1,249.08
  6. Step 6: Final answer
    x = 1,479.17

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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.