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Finding the Third Proportional to 305,921 and 656,140

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Solution

The third proportional to 305,921 and 656,140 is: 1,407,290.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,921 : 656,140 = 656,140 : x
  2. Step 2: Convert to fraction form
    305,921/656,140 = 656,140/x
  3. Step 3: Cross multiply
    305,921x = 656,140 × 656,140
  4. Step 4: Simplify right side
    305,921x = 430,519,699,600
  5. Step 5: Solve for x
    x = 430,519,699,600/305,921
  6. Step 6: Final answer
    x = 1,407,290.44

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.