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Finding the Third Proportional to 20,130 and 31,920

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Solution

The third proportional to 20,130 and 31,920 is: 50,615.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130 : 31,920 = 31,920 : x
  2. Step 2: Convert to fraction form
    20,130/31,920 = 31,920/x
  3. Step 3: Cross multiply
    20,130x = 31,920 × 31,920
  4. Step 4: Simplify right side
    20,130x = 1,018,886,400
  5. Step 5: Solve for x
    x = 1,018,886,400/20,130
  6. Step 6: Final answer
    x = 50,615.32

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.