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Finding the Fourth Proportional to 18,791.26, 25,922.87 and 12,420.34

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Solution

The fourth proportional to 18,791.26, 25,922.87 and 12,420.34 is: 17,134.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.26 : 25,922.87 = 12,420.34 : x
  2. Step 2: Convert to fraction form
    18,791.26/25,922.87 = 12,420.34/x
  3. Step 3: Cross multiply
    18,791.26x = 25,922.87 × 12,420.34
  4. Step 4: Simplify right side
    18,791.26x = 321,970,859.18
  5. Step 5: Solve for x
    x = 321,970,859.18/18,791.26
  6. Step 6: Final answer
    x = 17,134.08

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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.