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Finding the Fourth Proportional to 209.20, 313.76 and 72.22

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Solution

The fourth proportional to 209.20, 313.76 and 72.22 is: 108.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.20 : 313.76 = 72.22 : x
  2. Step 2: Convert to fraction form
    209.20/313.76 = 72.22/x
  3. Step 3: Cross multiply
    209.20x = 313.76 × 72.22
  4. Step 4: Simplify right side
    209.20x = 22,659.75
  5. Step 5: Solve for x
    x = 22,659.75/209.20
  6. Step 6: Final answer
    x = 108.32

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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.