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Finding the Third Proportional to 139 and 207.63

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Solution

The third proportional to 139 and 207.63 is: 310.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139 : 207.63 = 207.63 : x
  2. Step 2: Convert to fraction form
    139/207.63 = 207.63/x
  3. Step 3: Cross multiply
    139x = 207.63 × 207.63
  4. Step 4: Simplify right side
    139x = 43,108.14
  5. Step 5: Solve for x
    x = 43,108.14/139
  6. Step 6: Final answer
    x = 310.13

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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.