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Finding the Third Proportional to 53.25 and 81

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Solution

The third proportional to 53.25 and 81 is: 123.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.25 : 81 = 81 : x
  2. Step 2: Convert to fraction form
    53.25/81 = 81/x
  3. Step 3: Cross multiply
    53.25x = 81 × 81
  4. Step 4: Simplify right side
    53.25x = 6,561
  5. Step 5: Solve for x
    x = 6,561/53.25
  6. Step 6: Final answer
    x = 123.21

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.