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Finding the Fourth Proportional to 18,768.83, 28,156.49 and 5,621.99

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Solution

The fourth proportional to 18,768.83, 28,156.49 and 5,621.99 is: 8,433.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.83 : 28,156.49 = 5,621.99 : x
  2. Step 2: Convert to fraction form
    18,768.83/28,156.49 = 5,621.99/x
  3. Step 3: Cross multiply
    18,768.83x = 28,156.49 × 5,621.99
  4. Step 4: Simplify right side
    18,768.83x = 158,295,477.11
  5. Step 5: Solve for x
    x = 158,295,477.11/18,768.83
  6. Step 6: Final answer
    x = 8,433.96

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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.