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Finding the Third Proportional to 290,786 and 640,108

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Solution

The third proportional to 290,786 and 640,108 is: 1,409,071.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,786 : 640,108 = 640,108 : x
  2. Step 2: Convert to fraction form
    290,786/640,108 = 640,108/x
  3. Step 3: Cross multiply
    290,786x = 640,108 × 640,108
  4. Step 4: Simplify right side
    290,786x = 409,738,251,664
  5. Step 5: Solve for x
    x = 409,738,251,664/290,786
  6. Step 6: Final answer
    x = 1,409,071.45

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.