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Finding the Fourth Proportional to 209.77, 289.45 and 167.79

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Solution

The fourth proportional to 209.77, 289.45 and 167.79 is: 231.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.77 : 289.45 = 167.79 : x
  2. Step 2: Convert to fraction form
    209.77/289.45 = 167.79/x
  3. Step 3: Cross multiply
    209.77x = 289.45 × 167.79
  4. Step 4: Simplify right side
    209.77x = 48,568.11
  5. Step 5: Solve for x
    x = 48,568.11/209.77
  6. Step 6: Final answer
    x = 231.53

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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.