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Finding the Fourth Proportional to 149.72, 206.33 and 108.20

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Solution

The fourth proportional to 149.72, 206.33 and 108.20 is: 149.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.72 : 206.33 = 108.20 : x
  2. Step 2: Convert to fraction form
    149.72/206.33 = 108.20/x
  3. Step 3: Cross multiply
    149.72x = 206.33 × 108.20
  4. Step 4: Simplify right side
    149.72x = 22,323.33
  5. Step 5: Solve for x
    x = 22,323.33/149.72
  6. Step 6: Final answer
    x = 149.11

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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.