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Finding the Third Proportional to 21.36 and 31.32

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Solution

The third proportional to 21.36 and 31.32 is: 45.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.36 : 31.32 = 31.32 : x
  2. Step 2: Convert to fraction form
    21.36/31.32 = 31.32/x
  3. Step 3: Cross multiply
    21.36x = 31.32 × 31.32
  4. Step 4: Simplify right side
    21.36x = 981.21
  5. Step 5: Solve for x
    x = 981.21/21.36
  6. Step 6: Final answer
    x = 45.94

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.