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Finding the Fourth Proportional to 18,742.44, 28,111.80 and 4,891.44

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Solution

The fourth proportional to 18,742.44, 28,111.80 and 4,891.44 is: 7,336.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,742.44 : 28,111.80 = 4,891.44 : x
  2. Step 2: Convert to fraction form
    18,742.44/28,111.80 = 4,891.44/x
  3. Step 3: Cross multiply
    18,742.44x = 28,111.80 × 4,891.44
  4. Step 4: Simplify right side
    18,742.44x = 137,507,182.99
  5. Step 5: Solve for x
    x = 137,507,182.99/18,742.44
  6. Step 6: Final answer
    x = 7,336.67

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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.