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Finding the Third Proportional to 64 and 74.75

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Solution

The third proportional to 64 and 74.75 is: 87.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    64 : 74.75 = 74.75 : x
  2. Step 2: Convert to fraction form
    64/74.75 = 74.75/x
  3. Step 3: Cross multiply
    64x = 74.75 × 74.75
  4. Step 4: Simplify right side
    64x = 5,587.56
  5. Step 5: Solve for x
    x = 5,587.56/64
  6. Step 6: Final answer
    x = 87.31

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.