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Finding the Fourth Proportional to 130.72, 195.60 and 81.96

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Solution

The fourth proportional to 130.72, 195.60 and 81.96 is: 122.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.72 : 195.60 = 81.96 : x
  2. Step 2: Convert to fraction form
    130.72/195.60 = 81.96/x
  3. Step 3: Cross multiply
    130.72x = 195.60 × 81.96
  4. Step 4: Simplify right side
    130.72x = 16,031.38
  5. Step 5: Solve for x
    x = 16,031.38/130.72
  6. Step 6: Final answer
    x = 122.64

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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.