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Finding the Fourth Proportional to 130.86, 196.29 and 79.43

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Solution

The fourth proportional to 130.86, 196.29 and 79.43 is: 119.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.86 : 196.29 = 79.43 : x
  2. Step 2: Convert to fraction form
    130.86/196.29 = 79.43/x
  3. Step 3: Cross multiply
    130.86x = 196.29 × 79.43
  4. Step 4: Simplify right side
    130.86x = 15,590.33
  5. Step 5: Solve for x
    x = 15,590.33/130.86
  6. Step 6: Final answer
    x = 119.14

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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.