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Finding the Third Proportional to 8,685 and 13,440

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Solution

The third proportional to 8,685 and 13,440 is: 20,798.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685 : 13,440 = 13,440 : x
  2. Step 2: Convert to fraction form
    8,685/13,440 = 13,440/x
  3. Step 3: Cross multiply
    8,685x = 13,440 × 13,440
  4. Step 4: Simplify right side
    8,685x = 180,633,600
  5. Step 5: Solve for x
    x = 180,633,600/8,685
  6. Step 6: Final answer
    x = 20,798.34

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.