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Finding the Fourth Proportional to 221.97, 306.18 and 147.28

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Solution

The fourth proportional to 221.97, 306.18 and 147.28 is: 203.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.97 : 306.18 = 147.28 : x
  2. Step 2: Convert to fraction form
    221.97/306.18 = 147.28/x
  3. Step 3: Cross multiply
    221.97x = 306.18 × 147.28
  4. Step 4: Simplify right side
    221.97x = 45,094.19
  5. Step 5: Solve for x
    x = 45,094.19/221.97
  6. Step 6: Final answer
    x = 203.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.