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Finding the Third Proportional to 131,421 and 205,920

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Solution

The third proportional to 131,421 and 205,920 is: 322,650.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,421 : 205,920 = 205,920 : x
  2. Step 2: Convert to fraction form
    131,421/205,920 = 205,920/x
  3. Step 3: Cross multiply
    131,421x = 205,920 × 205,920
  4. Step 4: Simplify right side
    131,421x = 42,403,046,400
  5. Step 5: Solve for x
    x = 42,403,046,400/131,421
  6. Step 6: Final answer
    x = 322,650.46

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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.