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Finding the Third Proportional to 85,570 and 128,355

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Solution

The third proportional to 85,570 and 128,355 is: 192,532.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,570 : 128,355 = 128,355 : x
  2. Step 2: Convert to fraction form
    85,570/128,355 = 128,355/x
  3. Step 3: Cross multiply
    85,570x = 128,355 × 128,355
  4. Step 4: Simplify right side
    85,570x = 16,475,006,025
  5. Step 5: Solve for x
    x = 16,475,006,025/85,570
  6. Step 6: Final answer
    x = 192,532.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.