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Finding the Third Proportional to 621,680 and 912,120

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Solution

The third proportional to 621,680 and 912,120 is: 1,338,249.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,680 : 912,120 = 912,120 : x
  2. Step 2: Convert to fraction form
    621,680/912,120 = 912,120/x
  3. Step 3: Cross multiply
    621,680x = 912,120 × 912,120
  4. Step 4: Simplify right side
    621,680x = 831,962,894,400
  5. Step 5: Solve for x
    x = 831,962,894,400/621,680
  6. Step 6: Final answer
    x = 1,338,249.41

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.