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Finding the Fourth Proportional to 824.77, 1,236.75 and 385.92

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Solution

The fourth proportional to 824.77, 1,236.75 and 385.92 is: 578.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.77 : 1,236.75 = 385.92 : x
  2. Step 2: Convert to fraction form
    824.77/1,236.75 = 385.92/x
  3. Step 3: Cross multiply
    824.77x = 1,236.75 × 385.92
  4. Step 4: Simplify right side
    824.77x = 477,286.56
  5. Step 5: Solve for x
    x = 477,286.56/824.77
  6. Step 6: Final answer
    x = 578.69

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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.