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Finding the Third Proportional to 21,000 and 28,020

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Solution

The third proportional to 21,000 and 28,020 is: 37,386.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000 : 28,020 = 28,020 : x
  2. Step 2: Convert to fraction form
    21,000/28,020 = 28,020/x
  3. Step 3: Cross multiply
    21,000x = 28,020 × 28,020
  4. Step 4: Simplify right side
    21,000x = 785,120,400
  5. Step 5: Solve for x
    x = 785,120,400/21,000
  6. Step 6: Final answer
    x = 37,386.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.