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Finding the Fourth Proportional to 208.97, 288.39 and 115.72

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Solution

The fourth proportional to 208.97, 288.39 and 115.72 is: 159.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.97 : 288.39 = 115.72 : x
  2. Step 2: Convert to fraction form
    208.97/288.39 = 115.72/x
  3. Step 3: Cross multiply
    208.97x = 288.39 × 115.72
  4. Step 4: Simplify right side
    208.97x = 33,370.47
  5. Step 5: Solve for x
    x = 33,370.47/208.97
  6. Step 6: Final answer
    x = 159.69

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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.