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Finding the Fourth Proportional to 220.35, 328.38 and 207.21

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Solution

The fourth proportional to 220.35, 328.38 and 207.21 is: 308.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.35 : 328.38 = 207.21 : x
  2. Step 2: Convert to fraction form
    220.35/328.38 = 207.21/x
  3. Step 3: Cross multiply
    220.35x = 328.38 × 207.21
  4. Step 4: Simplify right side
    220.35x = 68,043.62
  5. Step 5: Solve for x
    x = 68,043.62/220.35
  6. Step 6: Final answer
    x = 308.80

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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.