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Finding the Third Proportional to 7.21 and 15.77

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Solution

The third proportional to 7.21 and 15.77 is: 34.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.21 : 15.77 = 15.77 : x
  2. Step 2: Convert to fraction form
    7.21/15.77 = 15.77/x
  3. Step 3: Cross multiply
    7.21x = 15.77 × 15.77
  4. Step 4: Simplify right side
    7.21x = 248.62
  5. Step 5: Solve for x
    x = 248.62/7.21
  6. Step 6: Final answer
    x = 34.50

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.