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Finding the Fourth Proportional to 130.80, 196.20 and 122.80

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Solution

The fourth proportional to 130.80, 196.20 and 122.80 is: 184.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 196.20 = 122.80 : x
  2. Step 2: Convert to fraction form
    130.80/196.20 = 122.80/x
  3. Step 3: Cross multiply
    130.80x = 196.20 × 122.80
  4. Step 4: Simplify right side
    130.80x = 24,093.36
  5. Step 5: Solve for x
    x = 24,093.36/130.80
  6. Step 6: Final answer
    x = 184.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.