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Finding the Fourth Proportional to 130.55, 195.90 and 81.86

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Solution

The fourth proportional to 130.55, 195.90 and 81.86 is: 122.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.55 : 195.90 = 81.86 : x
  2. Step 2: Convert to fraction form
    130.55/195.90 = 81.86/x
  3. Step 3: Cross multiply
    130.55x = 195.90 × 81.86
  4. Step 4: Simplify right side
    130.55x = 16,036.65
  5. Step 5: Solve for x
    x = 16,036.65/130.55
  6. Step 6: Final answer
    x = 122.84

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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.