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Finding the Fourth Proportional to 618.26, 853.05 and 385.22

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Solution

The fourth proportional to 618.26, 853.05 and 385.22 is: 531.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.26 : 853.05 = 385.22 : x
  2. Step 2: Convert to fraction form
    618.26/853.05 = 385.22/x
  3. Step 3: Cross multiply
    618.26x = 853.05 × 385.22
  4. Step 4: Simplify right side
    618.26x = 328,611.92
  5. Step 5: Solve for x
    x = 328,611.92/618.26
  6. Step 6: Final answer
    x = 531.51

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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.