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Finding the Fourth Proportional to 183.80, 275.76 and 81.11

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Solution

The fourth proportional to 183.80, 275.76 and 81.11 is: 121.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.80 : 275.76 = 81.11 : x
  2. Step 2: Convert to fraction form
    183.80/275.76 = 81.11/x
  3. Step 3: Cross multiply
    183.80x = 275.76 × 81.11
  4. Step 4: Simplify right side
    183.80x = 22,365.51
  5. Step 5: Solve for x
    x = 22,365.51/183.80
  6. Step 6: Final answer
    x = 121.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.