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Finding the Third Proportional to 411,396 and 621,480

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Solution

The third proportional to 411,396 and 621,480 is: 938,845.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,396 : 621,480 = 621,480 : x
  2. Step 2: Convert to fraction form
    411,396/621,480 = 621,480/x
  3. Step 3: Cross multiply
    411,396x = 621,480 × 621,480
  4. Step 4: Simplify right side
    411,396x = 386,237,390,400
  5. Step 5: Solve for x
    x = 386,237,390,400/411,396
  6. Step 6: Final answer
    x = 938,845.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.