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Finding the Third Proportional to 20,740 and 31,220

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Solution

The third proportional to 20,740 and 31,220 is: 46,995.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,740 : 31,220 = 31,220 : x
  2. Step 2: Convert to fraction form
    20,740/31,220 = 31,220/x
  3. Step 3: Cross multiply
    20,740x = 31,220 × 31,220
  4. Step 4: Simplify right side
    20,740x = 974,688,400
  5. Step 5: Solve for x
    x = 974,688,400/20,740
  6. Step 6: Final answer
    x = 46,995.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.