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Finding the Third Proportional to 128,555 and 276,865.50

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Solution

The third proportional to 128,555 and 276,865.50 is: 596,277.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,555 : 276,865.50 = 276,865.50 : x
  2. Step 2: Convert to fraction form
    128,555/276,865.50 = 276,865.50/x
  3. Step 3: Cross multiply
    128,555x = 276,865.50 × 276,865.50
  4. Step 4: Simplify right side
    128,555x = 76,654,505,090.25
  5. Step 5: Solve for x
    x = 76,654,505,090.25/128,555
  6. Step 6: Final answer
    x = 596,277.90

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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.