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Finding the Fourth Proportional to 221.22, 330.12 and 214.74

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Solution

The fourth proportional to 221.22, 330.12 and 214.74 is: 320.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.22 : 330.12 = 214.74 : x
  2. Step 2: Convert to fraction form
    221.22/330.12 = 214.74/x
  3. Step 3: Cross multiply
    221.22x = 330.12 × 214.74
  4. Step 4: Simplify right side
    221.22x = 70,889.97
  5. Step 5: Solve for x
    x = 70,889.97/221.22
  6. Step 6: Final answer
    x = 320.45

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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.