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Finding the Fourth Proportional to 209.28, 313.82 and 79.22

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Solution

The fourth proportional to 209.28, 313.82 and 79.22 is: 118.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.28 : 313.82 = 79.22 : x
  2. Step 2: Convert to fraction form
    209.28/313.82 = 79.22/x
  3. Step 3: Cross multiply
    209.28x = 313.82 × 79.22
  4. Step 4: Simplify right side
    209.28x = 24,860.82
  5. Step 5: Solve for x
    x = 24,860.82/209.28
  6. Step 6: Final answer
    x = 118.79

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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.