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Finding the Fourth Proportional to 208.76, 288.09 and 120.21

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Solution

The fourth proportional to 208.76, 288.09 and 120.21 is: 165.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.76 : 288.09 = 120.21 : x
  2. Step 2: Convert to fraction form
    208.76/288.09 = 120.21/x
  3. Step 3: Cross multiply
    208.76x = 288.09 × 120.21
  4. Step 4: Simplify right side
    208.76x = 34,632.23
  5. Step 5: Solve for x
    x = 34,632.23/208.76
  6. Step 6: Final answer
    x = 165.89

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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.