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Finding the Fourth Proportional to 221.16, 329.49 and 207.18

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Solution

The fourth proportional to 221.16, 329.49 and 207.18 is: 308.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.16 : 329.49 = 207.18 : x
  2. Step 2: Convert to fraction form
    221.16/329.49 = 207.18/x
  3. Step 3: Cross multiply
    221.16x = 329.49 × 207.18
  4. Step 4: Simplify right side
    221.16x = 68,263.74
  5. Step 5: Solve for x
    x = 68,263.74/221.16
  6. Step 6: Final answer
    x = 308.66

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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.