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Finding the Fourth Proportional to 1,221.23, 1,832.12 and 399.56

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Solution

The fourth proportional to 1,221.23, 1,832.12 and 399.56 is: 599.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.23 : 1,832.12 = 399.56 : x
  2. Step 2: Convert to fraction form
    1,221.23/1,832.12 = 399.56/x
  3. Step 3: Cross multiply
    1,221.23x = 1,832.12 × 399.56
  4. Step 4: Simplify right side
    1,221.23x = 732,041.87
  5. Step 5: Solve for x
    x = 732,041.87/1,221.23
  6. Step 6: Final answer
    x = 599.43

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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.