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Finding the Third Proportional to 518,378.50 and 811,407

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Solution

The third proportional to 518,378.50 and 811,407 is: 1,270,078.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,378.50 : 811,407 = 811,407 : x
  2. Step 2: Convert to fraction form
    518,378.50/811,407 = 811,407/x
  3. Step 3: Cross multiply
    518,378.50x = 811,407 × 811,407
  4. Step 4: Simplify right side
    518,378.50x = 658,381,319,649
  5. Step 5: Solve for x
    x = 658,381,319,649/518,378.50
  6. Step 6: Final answer
    x = 1,270,078.37

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.