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Finding the Fourth Proportional to 618.38, 854.19 and 494.90

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Solution

The fourth proportional to 618.38, 854.19 and 494.90 is: 683.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.38 : 854.19 = 494.90 : x
  2. Step 2: Convert to fraction form
    618.38/854.19 = 494.90/x
  3. Step 3: Cross multiply
    618.38x = 854.19 × 494.90
  4. Step 4: Simplify right side
    618.38x = 422,734.36
  5. Step 5: Solve for x
    x = 422,734.36/618.38
  6. Step 6: Final answer
    x = 683.62

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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.