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Finding the Fourth Proportional to 144.80, 199.40 and 122.70

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Solution

The fourth proportional to 144.80, 199.40 and 122.70 is: 168.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.80 : 199.40 = 122.70 : x
  2. Step 2: Convert to fraction form
    144.80/199.40 = 122.70/x
  3. Step 3: Cross multiply
    144.80x = 199.40 × 122.70
  4. Step 4: Simplify right side
    144.80x = 24,466.38
  5. Step 5: Solve for x
    x = 24,466.38/144.80
  6. Step 6: Final answer
    x = 168.97

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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.