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Finding the Fourth Proportional to 1,221.88, 1,832.49 and 400.75

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Solution

The fourth proportional to 1,221.88, 1,832.49 and 400.75 is: 601.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.88 : 1,832.49 = 400.75 : x
  2. Step 2: Convert to fraction form
    1,221.88/1,832.49 = 400.75/x
  3. Step 3: Cross multiply
    1,221.88x = 1,832.49 × 400.75
  4. Step 4: Simplify right side
    1,221.88x = 734,370.37
  5. Step 5: Solve for x
    x = 734,370.37/1,221.88
  6. Step 6: Final answer
    x = 601.02

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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.