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Finding the Fourth Proportional to 8,790.70, 12,131.16 and 4,811.81

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Solution

The fourth proportional to 8,790.70, 12,131.16 and 4,811.81 is: 6,640.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,790.70 : 12,131.16 = 4,811.81 : x
  2. Step 2: Convert to fraction form
    8,790.70/12,131.16 = 4,811.81/x
  3. Step 3: Cross multiply
    8,790.70x = 12,131.16 × 4,811.81
  4. Step 4: Simplify right side
    8,790.70x = 58,372,837.00
  5. Step 5: Solve for x
    x = 58,372,837.00/8,790.70
  6. Step 6: Final answer
    x = 6,640.29

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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.