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Finding the Fourth Proportional to 358.08, 494.20 and 218.20

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Solution

The fourth proportional to 358.08, 494.20 and 218.20 is: 301.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.08 : 494.20 = 218.20 : x
  2. Step 2: Convert to fraction form
    358.08/494.20 = 218.20/x
  3. Step 3: Cross multiply
    358.08x = 494.20 × 218.20
  4. Step 4: Simplify right side
    358.08x = 107,834.44
  5. Step 5: Solve for x
    x = 107,834.44/358.08
  6. Step 6: Final answer
    x = 301.15

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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.