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Finding the Fourth Proportional to 358.61, 494.87 and 218.75

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Solution

The fourth proportional to 358.61, 494.87 and 218.75 is: 301.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.61 : 494.87 = 218.75 : x
  2. Step 2: Convert to fraction form
    358.61/494.87 = 218.75/x
  3. Step 3: Cross multiply
    358.61x = 494.87 × 218.75
  4. Step 4: Simplify right side
    358.61x = 108,249.24
  5. Step 5: Solve for x
    x = 108,249.24/358.61
  6. Step 6: Final answer
    x = 301.86

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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.