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Finding the Fourth Proportional to 1,221.72, 1,832.10 and 441.57

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Solution

The fourth proportional to 1,221.72, 1,832.10 and 441.57 is: 662.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.72 : 1,832.10 = 441.57 : x
  2. Step 2: Convert to fraction form
    1,221.72/1,832.10 = 441.57/x
  3. Step 3: Cross multiply
    1,221.72x = 1,832.10 × 441.57
  4. Step 4: Simplify right side
    1,221.72x = 809,000.40
  5. Step 5: Solve for x
    x = 809,000.40/1,221.72
  6. Step 6: Final answer
    x = 662.18

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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.