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Finding the Fourth Proportional to 208.78, 288.03 and 164.94

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Solution

The fourth proportional to 208.78, 288.03 and 164.94 is: 227.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.78 : 288.03 = 164.94 : x
  2. Step 2: Convert to fraction form
    208.78/288.03 = 164.94/x
  3. Step 3: Cross multiply
    208.78x = 288.03 × 164.94
  4. Step 4: Simplify right side
    208.78x = 47,507.67
  5. Step 5: Solve for x
    x = 47,507.67/208.78
  6. Step 6: Final answer
    x = 227.55

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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.