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Finding the Fourth Proportional to 816.38, 1,224.44 and 239.12

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Solution

The fourth proportional to 816.38, 1,224.44 and 239.12 is: 358.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.38 : 1,224.44 = 239.12 : x
  2. Step 2: Convert to fraction form
    816.38/1,224.44 = 239.12/x
  3. Step 3: Cross multiply
    816.38x = 1,224.44 × 239.12
  4. Step 4: Simplify right side
    816.38x = 292,788.09
  5. Step 5: Solve for x
    x = 292,788.09/816.38
  6. Step 6: Final answer
    x = 358.64

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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.