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Finding the Fourth Proportional to 3,978.40, 5,964.90 and 1,899.40

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Solution

The fourth proportional to 3,978.40, 5,964.90 and 1,899.40 is: 2,847.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.40 : 5,964.90 = 1,899.40 : x
  2. Step 2: Convert to fraction form
    3,978.40/5,964.90 = 1,899.40/x
  3. Step 3: Cross multiply
    3,978.40x = 5,964.90 × 1,899.40
  4. Step 4: Simplify right side
    3,978.40x = 11,329,731.06
  5. Step 5: Solve for x
    x = 11,329,731.06/3,978.40
  6. Step 6: Final answer
    x = 2,847.81

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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.