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Finding the Fourth Proportional to 79.90, 119.79 and 34.19

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Solution

The fourth proportional to 79.90, 119.79 and 34.19 is: 51.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.90 : 119.79 = 34.19 : x
  2. Step 2: Convert to fraction form
    79.90/119.79 = 34.19/x
  3. Step 3: Cross multiply
    79.90x = 119.79 × 34.19
  4. Step 4: Simplify right side
    79.90x = 4,095.62
  5. Step 5: Solve for x
    x = 4,095.62/79.90
  6. Step 6: Final answer
    x = 51.26

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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.