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Finding the Fourth Proportional to 1,221.66, 1,832.79 and 355.97

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Solution

The fourth proportional to 1,221.66, 1,832.79 and 355.97 is: 534.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.66 : 1,832.79 = 355.97 : x
  2. Step 2: Convert to fraction form
    1,221.66/1,832.79 = 355.97/x
  3. Step 3: Cross multiply
    1,221.66x = 1,832.79 × 355.97
  4. Step 4: Simplify right side
    1,221.66x = 652,418.26
  5. Step 5: Solve for x
    x = 652,418.26/1,221.66
  6. Step 6: Final answer
    x = 534.04

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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.