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Finding the Third Proportional to 30.38 and 64.75

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Solution

The third proportional to 30.38 and 64.75 is: 138.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.38 : 64.75 = 64.75 : x
  2. Step 2: Convert to fraction form
    30.38/64.75 = 64.75/x
  3. Step 3: Cross multiply
    30.38x = 64.75 × 64.75
  4. Step 4: Simplify right side
    30.38x = 4,192.56
  5. Step 5: Solve for x
    x = 4,192.56/30.38
  6. Step 6: Final answer
    x = 138.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.