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Finding the Fourth Proportional to 1,221.85, 1,832.84 and 399.91

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Solution

The fourth proportional to 1,221.85, 1,832.84 and 399.91 is: 599.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.85 : 1,832.84 = 399.91 : x
  2. Step 2: Convert to fraction form
    1,221.85/1,832.84 = 399.91/x
  3. Step 3: Cross multiply
    1,221.85x = 1,832.84 × 399.91
  4. Step 4: Simplify right side
    1,221.85x = 732,971.04
  5. Step 5: Solve for x
    x = 732,971.04/1,221.85
  6. Step 6: Final answer
    x = 599.89

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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.