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Finding the Third Proportional to 299,118 and 640,276

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Solution

The third proportional to 299,118 and 640,276 is: 1,370,540.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,118 : 640,276 = 640,276 : x
  2. Step 2: Convert to fraction form
    299,118/640,276 = 640,276/x
  3. Step 3: Cross multiply
    299,118x = 640,276 × 640,276
  4. Step 4: Simplify right side
    299,118x = 409,953,356,176
  5. Step 5: Solve for x
    x = 409,953,356,176/299,118
  6. Step 6: Final answer
    x = 1,370,540.58

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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.