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Finding the Fourth Proportional to 220.62, 332.91 and 212.19

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Solution

The fourth proportional to 220.62, 332.91 and 212.19 is: 320.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.62 : 332.91 = 212.19 : x
  2. Step 2: Convert to fraction form
    220.62/332.91 = 212.19/x
  3. Step 3: Cross multiply
    220.62x = 332.91 × 212.19
  4. Step 4: Simplify right side
    220.62x = 70,640.17
  5. Step 5: Solve for x
    x = 70,640.17/220.62
  6. Step 6: Final answer
    x = 320.19

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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.