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Finding the Fourth Proportional to 18,679.76, 28,020.60 and 4,828.88

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Solution

The fourth proportional to 18,679.76, 28,020.60 and 4,828.88 is: 7,243.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.76 : 28,020.60 = 4,828.88 : x
  2. Step 2: Convert to fraction form
    18,679.76/28,020.60 = 4,828.88/x
  3. Step 3: Cross multiply
    18,679.76x = 28,020.60 × 4,828.88
  4. Step 4: Simplify right side
    18,679.76x = 135,308,114.93
  5. Step 5: Solve for x
    x = 135,308,114.93/18,679.76
  6. Step 6: Final answer
    x = 7,243.57

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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.