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Finding the Third Proportional to 30.25 and 64.56

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Solution

The third proportional to 30.25 and 64.56 is: 137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.25 : 64.56 = 64.56 : x
  2. Step 2: Convert to fraction form
    30.25/64.56 = 64.56/x
  3. Step 3: Cross multiply
    30.25x = 64.56 × 64.56
  4. Step 4: Simplify right side
    30.25x = 4,168.32
  5. Step 5: Solve for x
    x = 4,168.32/30.25
  6. Step 6: Final answer
    x = 137.80

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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.