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Finding the Third Proportional to 64.50 and 74

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Solution

The third proportional to 64.50 and 74 is: 84.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.50 : 74 = 74 : x
  2. Step 2: Convert to fraction form
    64.50/74 = 74/x
  3. Step 3: Cross multiply
    64.50x = 74 × 74
  4. Step 4: Simplify right side
    64.50x = 5,476
  5. Step 5: Solve for x
    x = 5,476/64.50
  6. Step 6: Final answer
    x = 84.90

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.