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Finding the Fourth Proportional to 618.59, 853.39 and 385.31

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Solution

The fourth proportional to 618.59, 853.39 and 385.31 is: 531.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.59 : 853.39 = 385.31 : x
  2. Step 2: Convert to fraction form
    618.59/853.39 = 385.31/x
  3. Step 3: Cross multiply
    618.59x = 853.39 × 385.31
  4. Step 4: Simplify right side
    618.59x = 328,819.70
  5. Step 5: Solve for x
    x = 328,819.70/618.59
  6. Step 6: Final answer
    x = 531.56

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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.