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Finding the Fourth Proportional to 141.12, 211.20 and 130.80

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Solution

The fourth proportional to 141.12, 211.20 and 130.80 is: 195.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.12 : 211.20 = 130.80 : x
  2. Step 2: Convert to fraction form
    141.12/211.20 = 130.80/x
  3. Step 3: Cross multiply
    141.12x = 211.20 × 130.80
  4. Step 4: Simplify right side
    141.12x = 27,624.96
  5. Step 5: Solve for x
    x = 27,624.96/141.12
  6. Step 6: Final answer
    x = 195.76

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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.