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Finding the Third Proportional to 261,890 and 400,445

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Solution

The third proportional to 261,890 and 400,445 is: 612,303.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,890 : 400,445 = 400,445 : x
  2. Step 2: Convert to fraction form
    261,890/400,445 = 400,445/x
  3. Step 3: Cross multiply
    261,890x = 400,445 × 400,445
  4. Step 4: Simplify right side
    261,890x = 160,356,198,025
  5. Step 5: Solve for x
    x = 160,356,198,025/261,890
  6. Step 6: Final answer
    x = 612,303.63

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.