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Finding the Fourth Proportional to 618.99, 853.98 and 494.94

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Solution

The fourth proportional to 618.99, 853.98 and 494.94 is: 682.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.99 : 853.98 = 494.94 : x
  2. Step 2: Convert to fraction form
    618.99/853.98 = 494.94/x
  3. Step 3: Cross multiply
    618.99x = 853.98 × 494.94
  4. Step 4: Simplify right side
    618.99x = 422,668.86
  5. Step 5: Solve for x
    x = 422,668.86/618.99
  6. Step 6: Final answer
    x = 682.84

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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.