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Finding the Third Proportional to 189.75 and 405.75

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Solution

The third proportional to 189.75 and 405.75 is: 867.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.75 : 405.75 = 405.75 : x
  2. Step 2: Convert to fraction form
    189.75/405.75 = 405.75/x
  3. Step 3: Cross multiply
    189.75x = 405.75 × 405.75
  4. Step 4: Simplify right side
    189.75x = 164,633.06
  5. Step 5: Solve for x
    x = 164,633.06/189.75
  6. Step 6: Final answer
    x = 867.63

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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.