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Finding the Fourth Proportional to 209.10, 288.57 and 126.21

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Solution

The fourth proportional to 209.10, 288.57 and 126.21 is: 174.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.10 : 288.57 = 126.21 : x
  2. Step 2: Convert to fraction form
    209.10/288.57 = 126.21/x
  3. Step 3: Cross multiply
    209.10x = 288.57 × 126.21
  4. Step 4: Simplify right side
    209.10x = 36,419.47
  5. Step 5: Solve for x
    x = 36,419.47/209.10
  6. Step 6: Final answer
    x = 174.17

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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.