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Finding the Fourth Proportional to 147.25, 221.03 and 108.78

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Solution

The fourth proportional to 147.25, 221.03 and 108.78 is: 163.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.25 : 221.03 = 108.78 : x
  2. Step 2: Convert to fraction form
    147.25/221.03 = 108.78/x
  3. Step 3: Cross multiply
    147.25x = 221.03 × 108.78
  4. Step 4: Simplify right side
    147.25x = 24,043.64
  5. Step 5: Solve for x
    x = 24,043.64/147.25
  6. Step 6: Final answer
    x = 163.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.