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Finding the Third Proportional to 64.88 and 91.31

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Solution

The third proportional to 64.88 and 91.31 is: 128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.88 : 91.31 = 91.31 : x
  2. Step 2: Convert to fraction form
    64.88/91.31 = 91.31/x
  3. Step 3: Cross multiply
    64.88x = 91.31 × 91.31
  4. Step 4: Simplify right side
    64.88x = 8,337.97
  5. Step 5: Solve for x
    x = 8,337.97/64.88
  6. Step 6: Final answer
    x = 128.52

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.