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Finding the Third Proportional to 15.37 and 21.38

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Solution

The third proportional to 15.37 and 21.38 is: 29.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.37 : 21.38 = 21.38 : x
  2. Step 2: Convert to fraction form
    15.37/21.38 = 21.38/x
  3. Step 3: Cross multiply
    15.37x = 21.38 × 21.38
  4. Step 4: Simplify right side
    15.37x = 457.02
  5. Step 5: Solve for x
    x = 457.02/15.37
  6. Step 6: Final answer
    x = 29.74

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.