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Finding the Fourth Proportional to 2,099.75, 3,150.08 and 639.02

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Solution

The fourth proportional to 2,099.75, 3,150.08 and 639.02 is: 958.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,099.75 : 3,150.08 = 639.02 : x
  2. Step 2: Convert to fraction form
    2,099.75/3,150.08 = 639.02/x
  3. Step 3: Cross multiply
    2,099.75x = 3,150.08 × 639.02
  4. Step 4: Simplify right side
    2,099.75x = 2,012,945.18
  5. Step 5: Solve for x
    x = 2,012,945.18/2,099.75
  6. Step 6: Final answer
    x = 958.66

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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.