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Finding the Third Proportional to 139.88 and 299.91

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Solution

The third proportional to 139.88 and 299.91 is: 643.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.88 : 299.91 = 299.91 : x
  2. Step 2: Convert to fraction form
    139.88/299.91 = 299.91/x
  3. Step 3: Cross multiply
    139.88x = 299.91 × 299.91
  4. Step 4: Simplify right side
    139.88x = 89,943.76
  5. Step 5: Solve for x
    x = 89,943.76/139.88
  6. Step 6: Final answer
    x = 643.03

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.