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Finding the Fourth Proportional to 149.80, 206.20 and 112.88

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Solution

The fourth proportional to 149.80, 206.20 and 112.88 is: 155.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.80 : 206.20 = 112.88 : x
  2. Step 2: Convert to fraction form
    149.80/206.20 = 112.88/x
  3. Step 3: Cross multiply
    149.80x = 206.20 × 112.88
  4. Step 4: Simplify right side
    149.80x = 23,275.86
  5. Step 5: Solve for x
    x = 23,275.86/149.80
  6. Step 6: Final answer
    x = 155.38

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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.