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Finding the Fourth Proportional to 18,489.87, 25,516.02 and 9,991.96

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Solution

The fourth proportional to 18,489.87, 25,516.02 and 9,991.96 is: 13,788.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489.87 : 25,516.02 = 9,991.96 : x
  2. Step 2: Convert to fraction form
    18,489.87/25,516.02 = 9,991.96/x
  3. Step 3: Cross multiply
    18,489.87x = 25,516.02 × 9,991.96
  4. Step 4: Simplify right side
    18,489.87x = 254,955,168.41
  5. Step 5: Solve for x
    x = 254,955,168.41/18,489.87
  6. Step 6: Final answer
    x = 13,788.91

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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.