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Finding the Fourth Proportional to 209.35, 288.90 and 120.86

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Solution

The fourth proportional to 209.35, 288.90 and 120.86 is: 166.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.35 : 288.90 = 120.86 : x
  2. Step 2: Convert to fraction form
    209.35/288.90 = 120.86/x
  3. Step 3: Cross multiply
    209.35x = 288.90 × 120.86
  4. Step 4: Simplify right side
    209.35x = 34,916.45
  5. Step 5: Solve for x
    x = 34,916.45/209.35
  6. Step 6: Final answer
    x = 166.79

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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.