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Finding the Third Proportional to 53.16 and 82.90

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Solution

The third proportional to 53.16 and 82.90 is: 129.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.16 : 82.90 = 82.90 : x
  2. Step 2: Convert to fraction form
    53.16/82.90 = 82.90/x
  3. Step 3: Cross multiply
    53.16x = 82.90 × 82.90
  4. Step 4: Simplify right side
    53.16x = 6,872.15
  5. Step 5: Solve for x
    x = 6,872.15/53.16
  6. Step 6: Final answer
    x = 129.28

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.