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Finding the Fourth Proportional to 208.88, 288.26 and 121.55

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Solution

The fourth proportional to 208.88, 288.26 and 121.55 is: 167.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.88 : 288.26 = 121.55 : x
  2. Step 2: Convert to fraction form
    208.88/288.26 = 121.55/x
  3. Step 3: Cross multiply
    208.88x = 288.26 × 121.55
  4. Step 4: Simplify right side
    208.88x = 35,035.95
  5. Step 5: Solve for x
    x = 35,035.95/208.88
  6. Step 6: Final answer
    x = 167.74

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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.