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Finding the Third Proportional to 128,438 and 170,472

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Solution

The third proportional to 128,438 and 170,472 is: 226,262.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,438 : 170,472 = 170,472 : x
  2. Step 2: Convert to fraction form
    128,438/170,472 = 170,472/x
  3. Step 3: Cross multiply
    128,438x = 170,472 × 170,472
  4. Step 4: Simplify right side
    128,438x = 29,060,702,784
  5. Step 5: Solve for x
    x = 29,060,702,784/128,438
  6. Step 6: Final answer
    x = 226,262.50

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.