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Finding the Fourth Proportional to 219.14, 328.94 and 206.84

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Solution

The fourth proportional to 219.14, 328.94 and 206.84 is: 310.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.14 : 328.94 = 206.84 : x
  2. Step 2: Convert to fraction form
    219.14/328.94 = 206.84/x
  3. Step 3: Cross multiply
    219.14x = 328.94 × 206.84
  4. Step 4: Simplify right side
    219.14x = 68,035.27
  5. Step 5: Solve for x
    x = 68,035.27/219.14
  6. Step 6: Final answer
    x = 310.47

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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.