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Finding the Fourth Proportional to 617.92, 852.78 and 385

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Solution

The fourth proportional to 617.92, 852.78 and 385 is: 531.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.92 : 852.78 = 385 : x
  2. Step 2: Convert to fraction form
    617.92/852.78 = 385/x
  3. Step 3: Cross multiply
    617.92x = 852.78 × 385
  4. Step 4: Simplify right side
    617.92x = 328,320.30
  5. Step 5: Solve for x
    x = 328,320.30/617.92
  6. Step 6: Final answer
    x = 531.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.