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Finding the Fourth Proportional to 824.39, 1,236.60 and 239.43

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Solution

The fourth proportional to 824.39, 1,236.60 and 239.43 is: 359.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.39 : 1,236.60 = 239.43 : x
  2. Step 2: Convert to fraction form
    824.39/1,236.60 = 239.43/x
  3. Step 3: Cross multiply
    824.39x = 1,236.60 × 239.43
  4. Step 4: Simplify right side
    824.39x = 296,079.14
  5. Step 5: Solve for x
    x = 296,079.14/824.39
  6. Step 6: Final answer
    x = 359.15

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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.