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Finding the Third Proportional to 128.14 and 256.29

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Solution

The third proportional to 128.14 and 256.29 is: 512.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.14 : 256.29 = 256.29 : x
  2. Step 2: Convert to fraction form
    128.14/256.29 = 256.29/x
  3. Step 3: Cross multiply
    128.14x = 256.29 × 256.29
  4. Step 4: Simplify right side
    128.14x = 65,684.08
  5. Step 5: Solve for x
    x = 65,684.08/128.14
  6. Step 6: Final answer
    x = 512.58

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.