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Finding the Third Proportional to 128,794.50 and 189,465

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Solution

The third proportional to 128,794.50 and 189,465 is: 278,715.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,794.50 : 189,465 = 189,465 : x
  2. Step 2: Convert to fraction form
    128,794.50/189,465 = 189,465/x
  3. Step 3: Cross multiply
    128,794.50x = 189,465 × 189,465
  4. Step 4: Simplify right side
    128,794.50x = 35,896,986,225
  5. Step 5: Solve for x
    x = 35,896,986,225/128,794.50
  6. Step 6: Final answer
    x = 278,715.21

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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.