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Finding the Fourth Proportional to 3,900.28, 5,850.08 and 978.58

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Solution

The fourth proportional to 3,900.28, 5,850.08 and 978.58 is: 1,467.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.28 : 5,850.08 = 978.58 : x
  2. Step 2: Convert to fraction form
    3,900.28/5,850.08 = 978.58/x
  3. Step 3: Cross multiply
    3,900.28x = 5,850.08 × 978.58
  4. Step 4: Simplify right side
    3,900.28x = 5,724,771.29
  5. Step 5: Solve for x
    x = 5,724,771.29/3,900.28
  6. Step 6: Final answer
    x = 1,467.78

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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.