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Finding the Third Proportional to 405,861 and 630,891

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Solution

The third proportional to 405,861 and 630,891 is: 980,689.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,861 : 630,891 = 630,891 : x
  2. Step 2: Convert to fraction form
    405,861/630,891 = 630,891/x
  3. Step 3: Cross multiply
    405,861x = 630,891 × 630,891
  4. Step 4: Simplify right side
    405,861x = 398,023,453,881
  5. Step 5: Solve for x
    x = 398,023,453,881/405,861
  6. Step 6: Final answer
    x = 980,689.09

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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.