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Finding the Third Proportional to 445,370 and 689,910

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Solution

The third proportional to 445,370 and 689,910 is: 1,068,719.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,370 : 689,910 = 689,910 : x
  2. Step 2: Convert to fraction form
    445,370/689,910 = 689,910/x
  3. Step 3: Cross multiply
    445,370x = 689,910 × 689,910
  4. Step 4: Simplify right side
    445,370x = 475,975,808,100
  5. Step 5: Solve for x
    x = 475,975,808,100/445,370
  6. Step 6: Final answer
    x = 1,068,719.96

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.