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Finding the Fourth Proportional to 195.39, 292.91 and 79.81

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Solution

The fourth proportional to 195.39, 292.91 and 79.81 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    195.39 : 292.91 = 79.81 : x
  2. Step 2: Convert to fraction form
    195.39/292.91 = 79.81/x
  3. Step 3: Cross multiply
    195.39x = 292.91 × 79.81
  4. Step 4: Simplify right side
    195.39x = 23,376.75
  5. Step 5: Solve for x
    x = 23,376.75/195.39
  6. Step 6: Final answer
    x = 119.64

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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.