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Finding the Fourth Proportional to 51.82, 77.71 and 21.37

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Solution

The fourth proportional to 51.82, 77.71 and 21.37 is: 32.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.82 : 77.71 = 21.37 : x
  2. Step 2: Convert to fraction form
    51.82/77.71 = 21.37/x
  3. Step 3: Cross multiply
    51.82x = 77.71 × 21.37
  4. Step 4: Simplify right side
    51.82x = 1,660.66
  5. Step 5: Solve for x
    x = 1,660.66/51.82
  6. Step 6: Final answer
    x = 32.05

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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.