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Finding the Fourth Proportional to 358.58, 494.85 and 218.68

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Solution

The fourth proportional to 358.58, 494.85 and 218.68 is: 301.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.58 : 494.85 = 218.68 : x
  2. Step 2: Convert to fraction form
    358.58/494.85 = 218.68/x
  3. Step 3: Cross multiply
    358.58x = 494.85 × 218.68
  4. Step 4: Simplify right side
    358.58x = 108,212.70
  5. Step 5: Solve for x
    x = 108,212.70/358.58
  6. Step 6: Final answer
    x = 301.78

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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.