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Finding the Fourth Proportional to 209.12, 290.12 and 207.29

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Solution

The fourth proportional to 209.12, 290.12 and 207.29 is: 287.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.12 : 290.12 = 207.29 : x
  2. Step 2: Convert to fraction form
    209.12/290.12 = 207.29/x
  3. Step 3: Cross multiply
    209.12x = 290.12 × 207.29
  4. Step 4: Simplify right side
    209.12x = 60,138.66
  5. Step 5: Solve for x
    x = 60,138.66/209.12
  6. Step 6: Final answer
    x = 287.59

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.