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Finding the Fourth Proportional to 209.28, 289.08 and 160.76

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Solution

The fourth proportional to 209.28, 289.08 and 160.76 is: 222.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.28 : 289.08 = 160.76 : x
  2. Step 2: Convert to fraction form
    209.28/289.08 = 160.76/x
  3. Step 3: Cross multiply
    209.28x = 289.08 × 160.76
  4. Step 4: Simplify right side
    209.28x = 46,471.06
  5. Step 5: Solve for x
    x = 46,471.06/209.28
  6. Step 6: Final answer
    x = 222.05

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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.