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Finding the Third Proportional to 128,420 and 276,604

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Solution

The third proportional to 128,420 and 276,604 is: 595,777.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420 : 276,604 = 276,604 : x
  2. Step 2: Convert to fraction form
    128,420/276,604 = 276,604/x
  3. Step 3: Cross multiply
    128,420x = 276,604 × 276,604
  4. Step 4: Simplify right side
    128,420x = 76,509,772,816
  5. Step 5: Solve for x
    x = 76,509,772,816/128,420
  6. Step 6: Final answer
    x = 595,777.70

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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.