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Finding the Fourth Proportional to 13,163.60, 18,165.11 and 7,856.48

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Solution

The fourth proportional to 13,163.60, 18,165.11 and 7,856.48 is: 10,841.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,163.60 : 18,165.11 = 7,856.48 : x
  2. Step 2: Convert to fraction form
    13,163.60/18,165.11 = 7,856.48/x
  3. Step 3: Cross multiply
    13,163.60x = 18,165.11 × 7,856.48
  4. Step 4: Simplify right side
    13,163.60x = 142,713,693.30
  5. Step 5: Solve for x
    x = 142,713,693.30/13,163.60
  6. Step 6: Final answer
    x = 10,841.54

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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.