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Finding the Fourth Proportional to 13,119.21, 18,099.99 and 9,138.87

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Solution

The fourth proportional to 13,119.21, 18,099.99 and 9,138.87 is: 12,608.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,119.21 : 18,099.99 = 9,138.87 : x
  2. Step 2: Convert to fraction form
    13,119.21/18,099.99 = 9,138.87/x
  3. Step 3: Cross multiply
    13,119.21x = 18,099.99 × 9,138.87
  4. Step 4: Simplify right side
    13,119.21x = 165,413,455.61
  5. Step 5: Solve for x
    x = 165,413,455.61/13,119.21
  6. Step 6: Final answer
    x = 12,608.49

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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.