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Finding the Fourth Proportional to 18,879.97, 28,318 and 6,399.67

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Solution

The fourth proportional to 18,879.97, 28,318 and 6,399.67 is: 9,598.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.97 : 28,318 = 6,399.67 : x
  2. Step 2: Convert to fraction form
    18,879.97/28,318 = 6,399.67/x
  3. Step 3: Cross multiply
    18,879.97x = 28,318 × 6,399.67
  4. Step 4: Simplify right side
    18,879.97x = 181,225,855.06
  5. Step 5: Solve for x
    x = 181,225,855.06/18,879.97
  6. Step 6: Final answer
    x = 9,598.84

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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.