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Finding the Third Proportional to 128,477 and 276,640

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Solution

The third proportional to 128,477 and 276,640 is: 595,668.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,477 : 276,640 = 276,640 : x
  2. Step 2: Convert to fraction form
    128,477/276,640 = 276,640/x
  3. Step 3: Cross multiply
    128,477x = 276,640 × 276,640
  4. Step 4: Simplify right side
    128,477x = 76,529,689,600
  5. Step 5: Solve for x
    x = 76,529,689,600/128,477
  6. Step 6: Final answer
    x = 595,668.40

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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.