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Finding the Third Proportional to 55.64 and 81.28

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Solution

The third proportional to 55.64 and 81.28 is: 118.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.64 : 81.28 = 81.28 : x
  2. Step 2: Convert to fraction form
    55.64/81.28 = 81.28/x
  3. Step 3: Cross multiply
    55.64x = 81.28 × 81.28
  4. Step 4: Simplify right side
    55.64x = 6,606.64
  5. Step 5: Solve for x
    x = 6,606.64/55.64
  6. Step 6: Final answer
    x = 118.74

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.