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Finding the Fourth Proportional to 209.25, 288.81 and 126.36

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Solution

The fourth proportional to 209.25, 288.81 and 126.36 is: 174.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.25 : 288.81 = 126.36 : x
  2. Step 2: Convert to fraction form
    209.25/288.81 = 126.36/x
  3. Step 3: Cross multiply
    209.25x = 288.81 × 126.36
  4. Step 4: Simplify right side
    209.25x = 36,494.03
  5. Step 5: Solve for x
    x = 36,494.03/209.25
  6. Step 6: Final answer
    x = 174.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.