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Finding the Third Proportional to 189.38 and 412.88

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Solution

The third proportional to 189.38 and 412.88 is: 900.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.38 : 412.88 = 412.88 : x
  2. Step 2: Convert to fraction form
    189.38/412.88 = 412.88/x
  3. Step 3: Cross multiply
    189.38x = 412.88 × 412.88
  4. Step 4: Simplify right side
    189.38x = 170,465.77
  5. Step 5: Solve for x
    x = 170,465.77/189.38
  6. Step 6: Final answer
    x = 900.15

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.