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Finding the Fourth Proportional to 219.84, 328.20 and 212.22

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Solution

The fourth proportional to 219.84, 328.20 and 212.22 is: 316.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.84 : 328.20 = 212.22 : x
  2. Step 2: Convert to fraction form
    219.84/328.20 = 212.22/x
  3. Step 3: Cross multiply
    219.84x = 328.20 × 212.22
  4. Step 4: Simplify right side
    219.84x = 69,650.60
  5. Step 5: Solve for x
    x = 69,650.60/219.84
  6. Step 6: Final answer
    x = 316.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.