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Finding the Third Proportional to 90,206 and 128,220

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Solution

The third proportional to 90,206 and 128,220 is: 182,253.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,206 : 128,220 = 128,220 : x
  2. Step 2: Convert to fraction form
    90,206/128,220 = 128,220/x
  3. Step 3: Cross multiply
    90,206x = 128,220 × 128,220
  4. Step 4: Simplify right side
    90,206x = 16,440,368,400
  5. Step 5: Solve for x
    x = 16,440,368,400/90,206
  6. Step 6: Final answer
    x = 182,253.60

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.