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Finding the Third Proportional to 18.28 and 39.28

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Solution

The third proportional to 18.28 and 39.28 is: 84.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.28 : 39.28 = 39.28 : x
  2. Step 2: Convert to fraction form
    18.28/39.28 = 39.28/x
  3. Step 3: Cross multiply
    18.28x = 39.28 × 39.28
  4. Step 4: Simplify right side
    18.28x = 1,543.02
  5. Step 5: Solve for x
    x = 1,543.02/18.28
  6. Step 6: Final answer
    x = 84.40

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.