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Finding the Fourth Proportional to 3,980.64, 5,973.30 and 1,789.44

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Solution

The fourth proportional to 3,980.64, 5,973.30 and 1,789.44 is: 2,685.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.64 : 5,973.30 = 1,789.44 : x
  2. Step 2: Convert to fraction form
    3,980.64/5,973.30 = 1,789.44/x
  3. Step 3: Cross multiply
    3,980.64x = 5,973.30 × 1,789.44
  4. Step 4: Simplify right side
    3,980.64x = 10,688,861.95
  5. Step 5: Solve for x
    x = 10,688,861.95/3,980.64
  6. Step 6: Final answer
    x = 2,685.21

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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.