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Finding the Third Proportional to 128,508.75 and 188,374.50

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Solution

The third proportional to 128,508.75 and 188,374.50 is: 276,128.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,508.75 : 188,374.50 = 188,374.50 : x
  2. Step 2: Convert to fraction form
    128,508.75/188,374.50 = 188,374.50/x
  3. Step 3: Cross multiply
    128,508.75x = 188,374.50 × 188,374.50
  4. Step 4: Simplify right side
    128,508.75x = 35,484,952,250.25
  5. Step 5: Solve for x
    x = 35,484,952,250.25/128,508.75
  6. Step 6: Final answer
    x = 276,128.69

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.