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Finding the Third Proportional to 128,789.75 and 189,459.75

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Solution

The third proportional to 128,789.75 and 189,459.75 is: 278,710.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,789.75 : 189,459.75 = 189,459.75 : x
  2. Step 2: Convert to fraction form
    128,789.75/189,459.75 = 189,459.75/x
  3. Step 3: Cross multiply
    128,789.75x = 189,459.75 × 189,459.75
  4. Step 4: Simplify right side
    128,789.75x = 35,894,996,870.06
  5. Step 5: Solve for x
    x = 35,894,996,870.06/128,789.75
  6. Step 6: Final answer
    x = 278,710.04

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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.