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Finding the Third Proportional to 8,720 and 14,240

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Solution

The third proportional to 8,720 and 14,240 is: 23,254.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720 : 14,240 = 14,240 : x
  2. Step 2: Convert to fraction form
    8,720/14,240 = 14,240/x
  3. Step 3: Cross multiply
    8,720x = 14,240 × 14,240
  4. Step 4: Simplify right side
    8,720x = 202,777,600
  5. Step 5: Solve for x
    x = 202,777,600/8,720
  6. Step 6: Final answer
    x = 23,254.31

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.