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Finding the Fourth Proportional to 358.68, 494.81 and 218.70

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Solution

The fourth proportional to 358.68, 494.81 and 218.70 is: 301.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.68 : 494.81 = 218.70 : x
  2. Step 2: Convert to fraction form
    358.68/494.81 = 218.70/x
  3. Step 3: Cross multiply
    358.68x = 494.81 × 218.70
  4. Step 4: Simplify right side
    358.68x = 108,214.67
  5. Step 5: Solve for x
    x = 108,214.67/358.68
  6. Step 6: Final answer
    x = 301.70

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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.