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Finding the Fourth Proportional to 1,249.20, 1,723.20 and 900

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Solution

The fourth proportional to 1,249.20, 1,723.20 and 900 is: 1,241.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.20 : 1,723.20 = 900 : x
  2. Step 2: Convert to fraction form
    1,249.20/1,723.20 = 900/x
  3. Step 3: Cross multiply
    1,249.20x = 1,723.20 × 900
  4. Step 4: Simplify right side
    1,249.20x = 1,550,880
  5. Step 5: Solve for x
    x = 1,550,880/1,249.20
  6. Step 6: Final answer
    x = 1,241.50

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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.