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Finding the Third Proportional to 128,390.50 and 187,830.75

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Solution

The third proportional to 128,390.50 and 187,830.75 is: 274,789.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.50 : 187,830.75 = 187,830.75 : x
  2. Step 2: Convert to fraction form
    128,390.50/187,830.75 = 187,830.75/x
  3. Step 3: Cross multiply
    128,390.50x = 187,830.75 × 187,830.75
  4. Step 4: Simplify right side
    128,390.50x = 35,280,390,645.56
  5. Step 5: Solve for x
    x = 35,280,390,645.56/128,390.50
  6. Step 6: Final answer
    x = 274,789.73

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.