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Finding the Third Proportional to 57,128 and 85,438.75

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Solution

The third proportional to 57,128 and 85,438.75 is: 127,779.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,128 : 85,438.75 = 85,438.75 : x
  2. Step 2: Convert to fraction form
    57,128/85,438.75 = 85,438.75/x
  3. Step 3: Cross multiply
    57,128x = 85,438.75 × 85,438.75
  4. Step 4: Simplify right side
    57,128x = 7,299,780,001.56
  5. Step 5: Solve for x
    x = 7,299,780,001.56/57,128
  6. Step 6: Final answer
    x = 127,779.37

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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.