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Finding the Fourth Proportional to 3,830.70, 5,748.21 and 1,639.20

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Solution

The fourth proportional to 3,830.70, 5,748.21 and 1,639.20 is: 2,459.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,830.70 : 5,748.21 = 1,639.20 : x
  2. Step 2: Convert to fraction form
    3,830.70/5,748.21 = 1,639.20/x
  3. Step 3: Cross multiply
    3,830.70x = 5,748.21 × 1,639.20
  4. Step 4: Simplify right side
    3,830.70x = 9,422,465.83
  5. Step 5: Solve for x
    x = 9,422,465.83/3,830.70
  6. Step 6: Final answer
    x = 2,459.72

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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.