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Finding the Fourth Proportional to 130.80, 195.78 and 76.52

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Solution

The fourth proportional to 130.80, 195.78 and 76.52 is: 114.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 195.78 = 76.52 : x
  2. Step 2: Convert to fraction form
    130.80/195.78 = 76.52/x
  3. Step 3: Cross multiply
    130.80x = 195.78 × 76.52
  4. Step 4: Simplify right side
    130.80x = 14,981.09
  5. Step 5: Solve for x
    x = 14,981.09/130.80
  6. Step 6: Final answer
    x = 114.53

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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.