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Finding the Fourth Proportional to 13,939.95, 20,891.07 and 7,690.59

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Solution

The fourth proportional to 13,939.95, 20,891.07 and 7,690.59 is: 11,525.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,939.95 : 20,891.07 = 7,690.59 : x
  2. Step 2: Convert to fraction form
    13,939.95/20,891.07 = 7,690.59/x
  3. Step 3: Cross multiply
    13,939.95x = 20,891.07 × 7,690.59
  4. Step 4: Simplify right side
    13,939.95x = 160,664,654.03
  5. Step 5: Solve for x
    x = 160,664,654.03/13,939.95
  6. Step 6: Final answer
    x = 11,525.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.