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Finding the Fourth Proportional to 8,881.72, 12,243.09 and 6,640.18

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Solution

The fourth proportional to 8,881.72, 12,243.09 and 6,640.18 is: 9,153.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,881.72 : 12,243.09 = 6,640.18 : x
  2. Step 2: Convert to fraction form
    8,881.72/12,243.09 = 6,640.18/x
  3. Step 3: Cross multiply
    8,881.72x = 12,243.09 × 6,640.18
  4. Step 4: Simplify right side
    8,881.72x = 81,296,321.36
  5. Step 5: Solve for x
    x = 81,296,321.36/8,881.72
  6. Step 6: Final answer
    x = 9,153.22

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1.5x scale

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.