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Finding the Fourth Proportional to 358.21, 494.19 and 218.28

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Solution

The fourth proportional to 358.21, 494.19 and 218.28 is: 301.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.21 : 494.19 = 218.28 : x
  2. Step 2: Convert to fraction form
    358.21/494.19 = 218.28/x
  3. Step 3: Cross multiply
    358.21x = 494.19 × 218.28
  4. Step 4: Simplify right side
    358.21x = 107,871.79
  5. Step 5: Solve for x
    x = 107,871.79/358.21
  6. Step 6: Final answer
    x = 301.14

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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.