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Finding the Fourth Proportional to 220.56, 329.16 and 214.80

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Solution

The fourth proportional to 220.56, 329.16 and 214.80 is: 320.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.56 : 329.16 = 214.80 : x
  2. Step 2: Convert to fraction form
    220.56/329.16 = 214.80/x
  3. Step 3: Cross multiply
    220.56x = 329.16 × 214.80
  4. Step 4: Simplify right side
    220.56x = 70,703.57
  5. Step 5: Solve for x
    x = 70,703.57/220.56
  6. Step 6: Final answer
    x = 320.56

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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.