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Finding the Fourth Proportional to 358.60, 494.85 and 218.69

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Solution

The fourth proportional to 358.60, 494.85 and 218.69 is: 301.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.60 : 494.85 = 218.69 : x
  2. Step 2: Convert to fraction form
    358.60/494.85 = 218.69/x
  3. Step 3: Cross multiply
    358.60x = 494.85 × 218.69
  4. Step 4: Simplify right side
    358.60x = 108,219.57
  5. Step 5: Solve for x
    x = 108,219.57/358.60
  6. Step 6: Final answer
    x = 301.79

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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.