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Finding the Fourth Proportional to 183.87, 275.74 and 81.20

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Solution

The fourth proportional to 183.87, 275.74 and 81.20 is: 121.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    183.87 : 275.74 = 81.20 : x
  2. Step 2: Convert to fraction form
    183.87/275.74 = 81.20/x
  3. Step 3: Cross multiply
    183.87x = 275.74 × 81.20
  4. Step 4: Simplify right side
    183.87x = 22,390.57
  5. Step 5: Solve for x
    x = 22,390.57/183.87
  6. Step 6: Final answer
    x = 121.77

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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.