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Finding the Fourth Proportional to 146.80, 202.45 and 122.20

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Solution

The fourth proportional to 146.80, 202.45 and 122.20 is: 168.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.80 : 202.45 = 122.20 : x
  2. Step 2: Convert to fraction form
    146.80/202.45 = 122.20/x
  3. Step 3: Cross multiply
    146.80x = 202.45 × 122.20
  4. Step 4: Simplify right side
    146.80x = 24,739.39
  5. Step 5: Solve for x
    x = 24,739.39/146.80
  6. Step 6: Final answer
    x = 168.52

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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.