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Finding the Third Proportional to 139.13 and 153.19

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Solution

The third proportional to 139.13 and 153.19 is: 168.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.13 : 153.19 = 153.19 : x
  2. Step 2: Convert to fraction form
    139.13/153.19 = 153.19/x
  3. Step 3: Cross multiply
    139.13x = 153.19 × 153.19
  4. Step 4: Simplify right side
    139.13x = 23,466.41
  5. Step 5: Solve for x
    x = 23,466.41/139.13
  6. Step 6: Final answer
    x = 168.67

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.