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Finding the Third Proportional to 31.88 and 70.13

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Solution

The third proportional to 31.88 and 70.13 is: 154.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.88 : 70.13 = 70.13 : x
  2. Step 2: Convert to fraction form
    31.88/70.13 = 70.13/x
  3. Step 3: Cross multiply
    31.88x = 70.13 × 70.13
  4. Step 4: Simplify right side
    31.88x = 4,917.52
  5. Step 5: Solve for x
    x = 4,917.52/31.88
  6. Step 6: Final answer
    x = 154.28

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.