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Finding the Third Proportional to 128,090 and 281,128

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Solution

The third proportional to 128,090 and 281,128 is: 617,011.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,090 : 281,128 = 281,128 : x
  2. Step 2: Convert to fraction form
    128,090/281,128 = 281,128/x
  3. Step 3: Cross multiply
    128,090x = 281,128 × 281,128
  4. Step 4: Simplify right side
    128,090x = 79,032,952,384
  5. Step 5: Solve for x
    x = 79,032,952,384/128,090
  6. Step 6: Final answer
    x = 617,011.10

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.