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Finding the Fourth Proportional to 130.80, 195.12 and 120.36

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Solution

The fourth proportional to 130.80, 195.12 and 120.36 is: 179.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 195.12 = 120.36 : x
  2. Step 2: Convert to fraction form
    130.80/195.12 = 120.36/x
  3. Step 3: Cross multiply
    130.80x = 195.12 × 120.36
  4. Step 4: Simplify right side
    130.80x = 23,484.64
  5. Step 5: Solve for x
    x = 23,484.64/130.80
  6. Step 6: Final answer
    x = 179.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.