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Finding the Fourth Proportional to 218.30, 328.64 and 199.16

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Solution

The fourth proportional to 218.30, 328.64 and 199.16 is: 299.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.30 : 328.64 = 199.16 : x
  2. Step 2: Convert to fraction form
    218.30/328.64 = 199.16/x
  3. Step 3: Cross multiply
    218.30x = 328.64 × 199.16
  4. Step 4: Simplify right side
    218.30x = 65,451.94
  5. Step 5: Solve for x
    x = 65,451.94/218.30
  6. Step 6: Final answer
    x = 299.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.