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Finding the Fourth Proportional to 208.77, 288.15 and 121.42

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Solution

The fourth proportional to 208.77, 288.15 and 121.42 is: 167.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.77 : 288.15 = 121.42 : x
  2. Step 2: Convert to fraction form
    208.77/288.15 = 121.42/x
  3. Step 3: Cross multiply
    208.77x = 288.15 × 121.42
  4. Step 4: Simplify right side
    208.77x = 34,987.17
  5. Step 5: Solve for x
    x = 34,987.17/208.77
  6. Step 6: Final answer
    x = 167.59

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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.