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Finding the Third Proportional to 128,348 and 278,080

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Solution

The third proportional to 128,348 and 278,080 is: 602,490.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,348 : 278,080 = 278,080 : x
  2. Step 2: Convert to fraction form
    128,348/278,080 = 278,080/x
  3. Step 3: Cross multiply
    128,348x = 278,080 × 278,080
  4. Step 4: Simplify right side
    128,348x = 77,328,486,400
  5. Step 5: Solve for x
    x = 77,328,486,400/128,348
  6. Step 6: Final answer
    x = 602,490.78

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.