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Finding the Third Proportional to 59,460 and 128,721

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Solution

The third proportional to 59,460 and 128,721 is: 278,659.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    59,460 : 128,721 = 128,721 : x
  2. Step 2: Convert to fraction form
    59,460/128,721 = 128,721/x
  3. Step 3: Cross multiply
    59,460x = 128,721 × 128,721
  4. Step 4: Simplify right side
    59,460x = 16,569,095,841
  5. Step 5: Solve for x
    x = 16,569,095,841/59,460
  6. Step 6: Final answer
    x = 278,659.53

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.