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Finding the Third Proportional to 299,416 and 640,320

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Solution

The third proportional to 299,416 and 640,320 is: 1,369,364.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,416 : 640,320 = 640,320 : x
  2. Step 2: Convert to fraction form
    299,416/640,320 = 640,320/x
  3. Step 3: Cross multiply
    299,416x = 640,320 × 640,320
  4. Step 4: Simplify right side
    299,416x = 410,009,702,400
  5. Step 5: Solve for x
    x = 410,009,702,400/299,416
  6. Step 6: Final answer
    x = 1,369,364.70

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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.