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Finding the Third Proportional to 643,220 and 945,556

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Solution

The third proportional to 643,220 and 945,556 is: 1,390,000.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,220 : 945,556 = 945,556 : x
  2. Step 2: Convert to fraction form
    643,220/945,556 = 945,556/x
  3. Step 3: Cross multiply
    643,220x = 945,556 × 945,556
  4. Step 4: Simplify right side
    643,220x = 894,076,149,136
  5. Step 5: Solve for x
    x = 894,076,149,136/643,220
  6. Step 6: Final answer
    x = 1,390,000.54

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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.