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Finding the Third Proportional to 139.13 and 207.56

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Solution

The third proportional to 139.13 and 207.56 is: 309.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.13 : 207.56 = 207.56 : x
  2. Step 2: Convert to fraction form
    139.13/207.56 = 207.56/x
  3. Step 3: Cross multiply
    139.13x = 207.56 × 207.56
  4. Step 4: Simplify right side
    139.13x = 43,082.19
  5. Step 5: Solve for x
    x = 43,082.19/139.13
  6. Step 6: Final answer
    x = 309.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.