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Finding the Fourth Proportional to 209.14, 313.72 and 79.14

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Solution

The fourth proportional to 209.14, 313.72 and 79.14 is: 118.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.14 : 313.72 = 79.14 : x
  2. Step 2: Convert to fraction form
    209.14/313.72 = 79.14/x
  3. Step 3: Cross multiply
    209.14x = 313.72 × 79.14
  4. Step 4: Simplify right side
    209.14x = 24,827.80
  5. Step 5: Solve for x
    x = 24,827.80/209.14
  6. Step 6: Final answer
    x = 118.71

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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.