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Finding the Fourth Proportional to 209.91, 314.82 and 118.65

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Solution

The fourth proportional to 209.91, 314.82 and 118.65 is: 177.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.91 : 314.82 = 118.65 : x
  2. Step 2: Convert to fraction form
    209.91/314.82 = 118.65/x
  3. Step 3: Cross multiply
    209.91x = 314.82 × 118.65
  4. Step 4: Simplify right side
    209.91x = 37,353.39
  5. Step 5: Solve for x
    x = 37,353.39/209.91
  6. Step 6: Final answer
    x = 177.95

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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.