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Finding the Fourth Proportional to 130.75, 196.09 and 78.71

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Solution

The fourth proportional to 130.75, 196.09 and 78.71 is: 118.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.75 : 196.09 = 78.71 : x
  2. Step 2: Convert to fraction form
    130.75/196.09 = 78.71/x
  3. Step 3: Cross multiply
    130.75x = 196.09 × 78.71
  4. Step 4: Simplify right side
    130.75x = 15,433.07
  5. Step 5: Solve for x
    x = 15,433.07/130.75
  6. Step 6: Final answer
    x = 118.04

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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.