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Finding the Fourth Proportional to 146.40, 202.20 and 142.80

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Solution

The fourth proportional to 146.40, 202.20 and 142.80 is: 197.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.40 : 202.20 = 142.80 : x
  2. Step 2: Convert to fraction form
    146.40/202.20 = 142.80/x
  3. Step 3: Cross multiply
    146.40x = 202.20 × 142.80
  4. Step 4: Simplify right side
    146.40x = 28,874.16
  5. Step 5: Solve for x
    x = 28,874.16/146.40
  6. Step 6: Final answer
    x = 197.23

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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.