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Finding the Fourth Proportional to 209.68, 314.53 and 149.09

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Solution

The fourth proportional to 209.68, 314.53 and 149.09 is: 223.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.68 : 314.53 = 149.09 : x
  2. Step 2: Convert to fraction form
    209.68/314.53 = 149.09/x
  3. Step 3: Cross multiply
    209.68x = 314.53 × 149.09
  4. Step 4: Simplify right side
    209.68x = 46,891.33
  5. Step 5: Solve for x
    x = 46,891.33/209.68
  6. Step 6: Final answer
    x = 223.64

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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.