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Finding the Fourth Proportional to 618.91, 853.84 and 356.87

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Solution

The fourth proportional to 618.91, 853.84 and 356.87 is: 492.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.91 : 853.84 = 356.87 : x
  2. Step 2: Convert to fraction form
    618.91/853.84 = 356.87/x
  3. Step 3: Cross multiply
    618.91x = 853.84 × 356.87
  4. Step 4: Simplify right side
    618.91x = 304,709.88
  5. Step 5: Solve for x
    x = 304,709.88/618.91
  6. Step 6: Final answer
    x = 492.33

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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.