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Finding the Fourth Proportional to 130.80, 196.14 and 76.72

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Solution

The fourth proportional to 130.80, 196.14 and 76.72 is: 115.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 196.14 = 76.72 : x
  2. Step 2: Convert to fraction form
    130.80/196.14 = 76.72/x
  3. Step 3: Cross multiply
    130.80x = 196.14 × 76.72
  4. Step 4: Simplify right side
    130.80x = 15,047.86
  5. Step 5: Solve for x
    x = 15,047.86/130.80
  6. Step 6: Final answer
    x = 115.04

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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.