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Finding the Fourth Proportional to 53.87, 80.81 and 17.81

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Solution

The fourth proportional to 53.87, 80.81 and 17.81 is: 26.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.87 : 80.81 = 17.81 : x
  2. Step 2: Convert to fraction form
    53.87/80.81 = 17.81/x
  3. Step 3: Cross multiply
    53.87x = 80.81 × 17.81
  4. Step 4: Simplify right side
    53.87x = 1,438.73
  5. Step 5: Solve for x
    x = 1,438.73/53.87
  6. Step 6: Final answer
    x = 26.71

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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.