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Finding the Third Proportional to 21.47 and 31.59

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Solution

The third proportional to 21.47 and 31.59 is: 46.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.47 : 31.59 = 31.59 : x
  2. Step 2: Convert to fraction form
    21.47/31.59 = 31.59/x
  3. Step 3: Cross multiply
    21.47x = 31.59 × 31.59
  4. Step 4: Simplify right side
    21.47x = 998.17
  5. Step 5: Solve for x
    x = 998.17/21.47
  6. Step 6: Final answer
    x = 46.49

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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.