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Finding the Third Proportional to 14.31 and 21.28

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Solution

The third proportional to 14.31 and 21.28 is: 31.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.31 : 21.28 = 21.28 : x
  2. Step 2: Convert to fraction form
    14.31/21.28 = 21.28/x
  3. Step 3: Cross multiply
    14.31x = 21.28 × 21.28
  4. Step 4: Simplify right side
    14.31x = 452.89
  5. Step 5: Solve for x
    x = 452.89/14.31
  6. Step 6: Final answer
    x = 31.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.