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Finding the Third Proportional to 56.81 and 87.19

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Solution

The third proportional to 56.81 and 87.19 is: 133.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.81 : 87.19 = 87.19 : x
  2. Step 2: Convert to fraction form
    56.81/87.19 = 87.19/x
  3. Step 3: Cross multiply
    56.81x = 87.19 × 87.19
  4. Step 4: Simplify right side
    56.81x = 7,601.66
  5. Step 5: Solve for x
    x = 7,601.66/56.81
  6. Step 6: Final answer
    x = 133.80

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.