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Finding the Fourth Proportional to 209.28, 289.09 and 151.37

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Solution

The fourth proportional to 209.28, 289.09 and 151.37 is: 209.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.28 : 289.09 = 151.37 : x
  2. Step 2: Convert to fraction form
    209.28/289.09 = 151.37/x
  3. Step 3: Cross multiply
    209.28x = 289.09 × 151.37
  4. Step 4: Simplify right side
    209.28x = 43,758.11
  5. Step 5: Solve for x
    x = 43,758.11/209.28
  6. Step 6: Final answer
    x = 209.09

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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.