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Finding the Third Proportional to 21,240 and 29,715

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Solution

The third proportional to 21,240 and 29,715 is: 41,571.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240 : 29,715 = 29,715 : x
  2. Step 2: Convert to fraction form
    21,240/29,715 = 29,715/x
  3. Step 3: Cross multiply
    21,240x = 29,715 × 29,715
  4. Step 4: Simplify right side
    21,240x = 882,981,225
  5. Step 5: Solve for x
    x = 882,981,225/21,240
  6. Step 6: Final answer
    x = 41,571.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.