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Finding the Fourth Proportional to 18,391.88, 25,380.86 and 10,008.38

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Solution

The fourth proportional to 18,391.88, 25,380.86 and 10,008.38 is: 13,811.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,391.88 : 25,380.86 = 10,008.38 : x
  2. Step 2: Convert to fraction form
    18,391.88/25,380.86 = 10,008.38/x
  3. Step 3: Cross multiply
    18,391.88x = 25,380.86 × 10,008.38
  4. Step 4: Simplify right side
    18,391.88x = 254,021,114.66
  5. Step 5: Solve for x
    x = 254,021,114.66/18,391.88
  6. Step 6: Final answer
    x = 13,811.59

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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.