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Finding the Fourth Proportional to 13,137.92, 18,129.59 and 7,471.90

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Solution

The fourth proportional to 13,137.92, 18,129.59 and 7,471.90 is: 10,310.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.92 : 18,129.59 = 7,471.90 : x
  2. Step 2: Convert to fraction form
    13,137.92/18,129.59 = 7,471.90/x
  3. Step 3: Cross multiply
    13,137.92x = 18,129.59 × 7,471.90
  4. Step 4: Simplify right side
    13,137.92x = 135,462,392.87
  5. Step 5: Solve for x
    x = 135,462,392.87/13,137.92
  6. Step 6: Final answer
    x = 10,310.80

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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.