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Finding the Third Proportional to 139.25 and 291.63

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Solution

The third proportional to 139.25 and 291.63 is: 610.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.25 : 291.63 = 291.63 : x
  2. Step 2: Convert to fraction form
    139.25/291.63 = 291.63/x
  3. Step 3: Cross multiply
    139.25x = 291.63 × 291.63
  4. Step 4: Simplify right side
    139.25x = 85,045.14
  5. Step 5: Solve for x
    x = 85,045.14/139.25
  6. Step 6: Final answer
    x = 610.74

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.