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Finding the Fourth Proportional to 209.43, 289.16 and 187.23

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Solution

The fourth proportional to 209.43, 289.16 and 187.23 is: 258.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.43 : 289.16 = 187.23 : x
  2. Step 2: Convert to fraction form
    209.43/289.16 = 187.23/x
  3. Step 3: Cross multiply
    209.43x = 289.16 × 187.23
  4. Step 4: Simplify right side
    209.43x = 54,138.49
  5. Step 5: Solve for x
    x = 54,138.49/209.43
  6. Step 6: Final answer
    x = 258.50

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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.