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Finding the Fourth Proportional to 128,227, 176,950 and 71,638.80

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Solution

The fourth proportional to 128,227, 176,950 and 71,638.80 is: 98,859.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,227 : 176,950 = 71,638.80 : x
  2. Step 2: Convert to fraction form
    128,227/176,950 = 71,638.80/x
  3. Step 3: Cross multiply
    128,227x = 176,950 × 71,638.80
  4. Step 4: Simplify right side
    128,227x = 12,676,485,660
  5. Step 5: Solve for x
    x = 12,676,485,660/128,227
  6. Step 6: Final answer
    x = 98,859.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.