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Finding the Third Proportional to 189,258 and 415,380

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Solution

The third proportional to 189,258 and 415,380 is: 911,668.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,258 : 415,380 = 415,380 : x
  2. Step 2: Convert to fraction form
    189,258/415,380 = 415,380/x
  3. Step 3: Cross multiply
    189,258x = 415,380 × 415,380
  4. Step 4: Simplify right side
    189,258x = 172,540,544,400
  5. Step 5: Solve for x
    x = 172,540,544,400/189,258
  6. Step 6: Final answer
    x = 911,668.43

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.