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Finding the Fourth Proportional to 18,960.75, 28,454.09 and 6,648.75

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Solution

The fourth proportional to 18,960.75, 28,454.09 and 6,648.75 is: 9,977.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,960.75 : 28,454.09 = 6,648.75 : x
  2. Step 2: Convert to fraction form
    18,960.75/28,454.09 = 6,648.75/x
  3. Step 3: Cross multiply
    18,960.75x = 28,454.09 × 6,648.75
  4. Step 4: Simplify right side
    18,960.75x = 189,184,097.64
  5. Step 5: Solve for x
    x = 189,184,097.64/18,960.75
  6. Step 6: Final answer
    x = 9,977.67

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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.