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Finding the Fourth Proportional to 209.68, 289.40 and 126.84

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Solution

The fourth proportional to 209.68, 289.40 and 126.84 is: 175.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.68 : 289.40 = 126.84 : x
  2. Step 2: Convert to fraction form
    209.68/289.40 = 126.84/x
  3. Step 3: Cross multiply
    209.68x = 289.40 × 126.84
  4. Step 4: Simplify right side
    209.68x = 36,707.50
  5. Step 5: Solve for x
    x = 36,707.50/209.68
  6. Step 6: Final answer
    x = 175.06

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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.