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Finding the Third Proportional to 428,569.50 and 640,749.75

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Solution

The third proportional to 428,569.50 and 640,749.75 is: 957,978.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,569.50 : 640,749.75 = 640,749.75 : x
  2. Step 2: Convert to fraction form
    428,569.50/640,749.75 = 640,749.75/x
  3. Step 3: Cross multiply
    428,569.50x = 640,749.75 × 640,749.75
  4. Step 4: Simplify right side
    428,569.50x = 410,560,242,125.06
  5. Step 5: Solve for x
    x = 410,560,242,125.06/428,569.50
  6. Step 6: Final answer
    x = 957,978.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.