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Finding the Third Proportional to 189.19 and 398.63

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Solution

The third proportional to 189.19 and 398.63 is: 839.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.19 : 398.63 = 398.63 : x
  2. Step 2: Convert to fraction form
    189.19/398.63 = 398.63/x
  3. Step 3: Cross multiply
    189.19x = 398.63 × 398.63
  4. Step 4: Simplify right side
    189.19x = 158,901.89
  5. Step 5: Solve for x
    x = 158,901.89/189.19
  6. Step 6: Final answer
    x = 839.92

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.