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Finding the Fourth Proportional to 18,665.88, 25,723.49 and 13,351.47

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Solution

The fourth proportional to 18,665.88, 25,723.49 and 13,351.47 is: 18,399.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.88 : 25,723.49 = 13,351.47 : x
  2. Step 2: Convert to fraction form
    18,665.88/25,723.49 = 13,351.47/x
  3. Step 3: Cross multiply
    18,665.88x = 25,723.49 × 13,351.47
  4. Step 4: Simplify right side
    18,665.88x = 343,446,338.27
  5. Step 5: Solve for x
    x = 343,446,338.27/18,665.88
  6. Step 6: Final answer
    x = 18,399.69

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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.