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Finding the Third Proportional to 15.62 and 20.31

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Solution

The third proportional to 15.62 and 20.31 is: 26.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.62 : 20.31 = 20.31 : x
  2. Step 2: Convert to fraction form
    15.62/20.31 = 20.31/x
  3. Step 3: Cross multiply
    15.62x = 20.31 × 20.31
  4. Step 4: Simplify right side
    15.62x = 412.46
  5. Step 5: Solve for x
    x = 412.46/15.62
  6. Step 6: Final answer
    x = 26.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.