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Finding the Fourth Proportional to 618.80, 853.91 and 338.98

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Solution

The fourth proportional to 618.80, 853.91 and 338.98 is: 467.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.80 : 853.91 = 338.98 : x
  2. Step 2: Convert to fraction form
    618.80/853.91 = 338.98/x
  3. Step 3: Cross multiply
    618.80x = 853.91 × 338.98
  4. Step 4: Simplify right side
    618.80x = 289,462.46
  5. Step 5: Solve for x
    x = 289,462.46/618.80
  6. Step 6: Final answer
    x = 467.78

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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.