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Finding the Fourth Proportional to 3,980.76, 5,966.46 and 1,639.32

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Solution

The fourth proportional to 3,980.76, 5,966.46 and 1,639.32 is: 2,457.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.76 : 5,966.46 = 1,639.32 : x
  2. Step 2: Convert to fraction form
    3,980.76/5,966.46 = 1,639.32/x
  3. Step 3: Cross multiply
    3,980.76x = 5,966.46 × 1,639.32
  4. Step 4: Simplify right side
    3,980.76x = 9,780,937.21
  5. Step 5: Solve for x
    x = 9,780,937.21/3,980.76
  6. Step 6: Final answer
    x = 2,457.05

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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.