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Finding the Third Proportional to 128,215.13 and 272,286

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Solution

The third proportional to 128,215.13 and 272,286 is: 578,244.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,215.13 : 272,286 = 272,286 : x
  2. Step 2: Convert to fraction form
    128,215.13/272,286 = 272,286/x
  3. Step 3: Cross multiply
    128,215.13x = 272,286 × 272,286
  4. Step 4: Simplify right side
    128,215.13x = 74,139,665,796
  5. Step 5: Solve for x
    x = 74,139,665,796/128,215.13
  6. Step 6: Final answer
    x = 578,244.30

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.