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Finding the Fourth Proportional to 1,221.31, 1,832.16 and 399.34

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Solution

The fourth proportional to 1,221.31, 1,832.16 and 399.34 is: 599.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.31 : 1,832.16 = 399.34 : x
  2. Step 2: Convert to fraction form
    1,221.31/1,832.16 = 399.34/x
  3. Step 3: Cross multiply
    1,221.31x = 1,832.16 × 399.34
  4. Step 4: Simplify right side
    1,221.31x = 731,654.77
  5. Step 5: Solve for x
    x = 731,654.77/1,221.31
  6. Step 6: Final answer
    x = 599.07

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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.