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Finding the Third Proportional to 288,390 and 621,153

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Solution

The third proportional to 288,390 and 621,153 is: 1,337,879.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,390 : 621,153 = 621,153 : x
  2. Step 2: Convert to fraction form
    288,390/621,153 = 621,153/x
  3. Step 3: Cross multiply
    288,390x = 621,153 × 621,153
  4. Step 4: Simplify right side
    288,390x = 385,831,049,409
  5. Step 5: Solve for x
    x = 385,831,049,409/288,390
  6. Step 6: Final answer
    x = 1,337,879.43

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.