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Finding the Fourth Proportional to 18,828.40, 28,246.65 and 5,679.67

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Solution

The fourth proportional to 18,828.40, 28,246.65 and 5,679.67 is: 8,520.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,828.40 : 28,246.65 = 5,679.67 : x
  2. Step 2: Convert to fraction form
    18,828.40/28,246.65 = 5,679.67/x
  3. Step 3: Cross multiply
    18,828.40x = 28,246.65 × 5,679.67
  4. Step 4: Simplify right side
    18,828.40x = 160,431,650.61
  5. Step 5: Solve for x
    x = 160,431,650.61/18,828.40
  6. Step 6: Final answer
    x = 8,520.73

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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.