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Finding the Fourth Proportional to 220.84, 330.88 and 212.41

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Solution

The fourth proportional to 220.84, 330.88 and 212.41 is: 318.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.84 : 330.88 = 212.41 : x
  2. Step 2: Convert to fraction form
    220.84/330.88 = 212.41/x
  3. Step 3: Cross multiply
    220.84x = 330.88 × 212.41
  4. Step 4: Simplify right side
    220.84x = 70,282.22
  5. Step 5: Solve for x
    x = 70,282.22/220.84
  6. Step 6: Final answer
    x = 318.25

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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.