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Finding the Third Proportional to 8,320 and 18,780

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Solution

The third proportional to 8,320 and 18,780 is: 42,390.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,320 : 18,780 = 18,780 : x
  2. Step 2: Convert to fraction form
    8,320/18,780 = 18,780/x
  3. Step 3: Cross multiply
    8,320x = 18,780 × 18,780
  4. Step 4: Simplify right side
    8,320x = 352,688,400
  5. Step 5: Solve for x
    x = 352,688,400/8,320
  6. Step 6: Final answer
    x = 42,390.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.