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Finding the Fourth Proportional to 208.78, 288.39 and 160.26

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Solution

The fourth proportional to 208.78, 288.39 and 160.26 is: 221.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.78 : 288.39 = 160.26 : x
  2. Step 2: Convert to fraction form
    208.78/288.39 = 160.26/x
  3. Step 3: Cross multiply
    208.78x = 288.39 × 160.26
  4. Step 4: Simplify right side
    208.78x = 46,215.54
  5. Step 5: Solve for x
    x = 46,215.54/208.78
  6. Step 6: Final answer
    x = 221.36

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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.