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Finding the Fourth Proportional to 13,729.89, 18,940.88 and 8,062.80

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Solution

The fourth proportional to 13,729.89, 18,940.88 and 8,062.80 is: 11,122.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,729.89 : 18,940.88 = 8,062.80 : x
  2. Step 2: Convert to fraction form
    13,729.89/18,940.88 = 8,062.80/x
  3. Step 3: Cross multiply
    13,729.89x = 18,940.88 × 8,062.80
  4. Step 4: Simplify right side
    13,729.89x = 152,716,486.95
  5. Step 5: Solve for x
    x = 152,716,486.95/13,729.89
  6. Step 6: Final answer
    x = 11,122.92

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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.