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Finding the Third Proportional to 15.40 and 34.80

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Solution

The third proportional to 15.40 and 34.80 is: 78.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.40 : 34.80 = 34.80 : x
  2. Step 2: Convert to fraction form
    15.40/34.80 = 34.80/x
  3. Step 3: Cross multiply
    15.40x = 34.80 × 34.80
  4. Step 4: Simplify right side
    15.40x = 1,211.37
  5. Step 5: Solve for x
    x = 1,211.37/15.40
  6. Step 6: Final answer
    x = 78.67

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Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.