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Finding the Fourth Proportional to 130.80, 195.80 and 105.02

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Solution

The fourth proportional to 130.80, 195.80 and 105.02 is: 157.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 195.80 = 105.02 : x
  2. Step 2: Convert to fraction form
    130.80/195.80 = 105.02/x
  3. Step 3: Cross multiply
    130.80x = 195.80 × 105.02
  4. Step 4: Simplify right side
    130.80x = 20,561.41
  5. Step 5: Solve for x
    x = 20,561.41/130.80
  6. Step 6: Final answer
    x = 157.20

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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.