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Finding the Fourth Proportional to 402.05, 602.11 and 218.99

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Solution

The fourth proportional to 402.05, 602.11 and 218.99 is: 327.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.05 : 602.11 = 218.99 : x
  2. Step 2: Convert to fraction form
    402.05/602.11 = 218.99/x
  3. Step 3: Cross multiply
    402.05x = 602.11 × 218.99
  4. Step 4: Simplify right side
    402.05x = 131,856.07
  5. Step 5: Solve for x
    x = 131,856.07/402.05
  6. Step 6: Final answer
    x = 327.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.