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Finding the Fourth Proportional to 208.86, 288.22 and 120.36

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Solution

The fourth proportional to 208.86, 288.22 and 120.36 is: 166.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.86 : 288.22 = 120.36 : x
  2. Step 2: Convert to fraction form
    208.86/288.22 = 120.36/x
  3. Step 3: Cross multiply
    208.86x = 288.22 × 120.36
  4. Step 4: Simplify right side
    208.86x = 34,690.16
  5. Step 5: Solve for x
    x = 34,690.16/208.86
  6. Step 6: Final answer
    x = 166.09

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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.