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Finding the Fourth Proportional to 13,719.91, 18,940.02 and 9,190.39

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Solution

The fourth proportional to 13,719.91, 18,940.02 and 9,190.39 is: 12,687.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,719.91 : 18,940.02 = 9,190.39 : x
  2. Step 2: Convert to fraction form
    13,719.91/18,940.02 = 9,190.39/x
  3. Step 3: Cross multiply
    13,719.91x = 18,940.02 × 9,190.39
  4. Step 4: Simplify right side
    13,719.91x = 174,066,170.41
  5. Step 5: Solve for x
    x = 174,066,170.41/13,719.91
  6. Step 6: Final answer
    x = 12,687.12

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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.