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Finding the Fourth Proportional to 8,108.70, 12,128.48 and 4,981.02

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Solution

The fourth proportional to 8,108.70, 12,128.48 and 4,981.02 is: 7,450.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,108.70 : 12,128.48 = 4,981.02 : x
  2. Step 2: Convert to fraction form
    8,108.70/12,128.48 = 4,981.02/x
  3. Step 3: Cross multiply
    8,108.70x = 12,128.48 × 4,981.02
  4. Step 4: Simplify right side
    8,108.70x = 60,412,201.45
  5. Step 5: Solve for x
    x = 60,412,201.45/8,108.70
  6. Step 6: Final answer
    x = 7,450.29

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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.