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Finding the Fourth Proportional to 2,858.85, 3,945.72 and 1,679.98

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Solution

The fourth proportional to 2,858.85, 3,945.72 and 1,679.98 is: 2,318.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,858.85 : 3,945.72 = 1,679.98 : x
  2. Step 2: Convert to fraction form
    2,858.85/3,945.72 = 1,679.98/x
  3. Step 3: Cross multiply
    2,858.85x = 3,945.72 × 1,679.98
  4. Step 4: Simplify right side
    2,858.85x = 6,628,730.69
  5. Step 5: Solve for x
    x = 6,628,730.69/2,858.85
  6. Step 6: Final answer
    x = 2,318.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.