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Finding the Fourth Proportional to 8,629.92, 11,892.96 and 7,210.80

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Solution

The fourth proportional to 8,629.92, 11,892.96 and 7,210.80 is: 9,937.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,629.92 : 11,892.96 = 7,210.80 : x
  2. Step 2: Convert to fraction form
    8,629.92/11,892.96 = 7,210.80/x
  3. Step 3: Cross multiply
    8,629.92x = 11,892.96 × 7,210.80
  4. Step 4: Simplify right side
    8,629.92x = 85,757,755.97
  5. Step 5: Solve for x
    x = 85,757,755.97/8,629.92
  6. Step 6: Final answer
    x = 9,937.26

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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.