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Finding the Fourth Proportional to 208.73, 288.07 and 115.51

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Solution

The fourth proportional to 208.73, 288.07 and 115.51 is: 159.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.73 : 288.07 = 115.51 : x
  2. Step 2: Convert to fraction form
    208.73/288.07 = 115.51/x
  3. Step 3: Cross multiply
    208.73x = 288.07 × 115.51
  4. Step 4: Simplify right side
    208.73x = 33,273.77
  5. Step 5: Solve for x
    x = 33,273.77/208.73
  6. Step 6: Final answer
    x = 159.41

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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.