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Finding the Fourth Proportional to 18,782.61, 25,919.98 and 10,399.11

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Solution

The fourth proportional to 18,782.61, 25,919.98 and 10,399.11 is: 14,350.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,782.61 : 25,919.98 = 10,399.11 : x
  2. Step 2: Convert to fraction form
    18,782.61/25,919.98 = 10,399.11/x
  3. Step 3: Cross multiply
    18,782.61x = 25,919.98 × 10,399.11
  4. Step 4: Simplify right side
    18,782.61x = 269,544,723.22
  5. Step 5: Solve for x
    x = 269,544,723.22/18,782.61
  6. Step 6: Final answer
    x = 14,350.76

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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.