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Finding the Third Proportional to 83,018 and 128,417

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Solution

The third proportional to 83,018 and 128,417 is: 198,642.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,018 : 128,417 = 128,417 : x
  2. Step 2: Convert to fraction form
    83,018/128,417 = 128,417/x
  3. Step 3: Cross multiply
    83,018x = 128,417 × 128,417
  4. Step 4: Simplify right side
    83,018x = 16,490,925,889
  5. Step 5: Solve for x
    x = 16,490,925,889/83,018
  6. Step 6: Final answer
    x = 198,642.77

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.