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Finding the Third Proportional to 68.63 and 145.69

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Solution

The third proportional to 68.63 and 145.69 is: 309.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.63 : 145.69 = 145.69 : x
  2. Step 2: Convert to fraction form
    68.63/145.69 = 145.69/x
  3. Step 3: Cross multiply
    68.63x = 145.69 × 145.69
  4. Step 4: Simplify right side
    68.63x = 21,224.85
  5. Step 5: Solve for x
    x = 21,224.85/68.63
  6. Step 6: Final answer
    x = 309.29

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.