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Finding the Fourth Proportional to 9,318.72, 13,979.03 and 3,078.75

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Solution

The fourth proportional to 9,318.72, 13,979.03 and 3,078.75 is: 4,618.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,318.72 : 13,979.03 = 3,078.75 : x
  2. Step 2: Convert to fraction form
    9,318.72/13,979.03 = 3,078.75/x
  3. Step 3: Cross multiply
    9,318.72x = 13,979.03 × 3,078.75
  4. Step 4: Simplify right side
    9,318.72x = 43,037,923.22
  5. Step 5: Solve for x
    x = 43,037,923.22/9,318.72
  6. Step 6: Final answer
    x = 4,618.44

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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.