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Finding the Fourth Proportional to 18,999.76, 28,449.96 and 13,422.96

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Solution

The fourth proportional to 18,999.76, 28,449.96 and 13,422.96 is: 20,099.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.76 : 28,449.96 = 13,422.96 : x
  2. Step 2: Convert to fraction form
    18,999.76/28,449.96 = 13,422.96/x
  3. Step 3: Cross multiply
    18,999.76x = 28,449.96 × 13,422.96
  4. Step 4: Simplify right side
    18,999.76x = 381,882,675.08
  5. Step 5: Solve for x
    x = 381,882,675.08/18,999.76
  6. Step 6: Final answer
    x = 20,099.34

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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.