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Finding the Fourth Proportional to 3,986.19, 5,979.17 and 1,907.67

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Solution

The fourth proportional to 3,986.19, 5,979.17 and 1,907.67 is: 2,861.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.19 : 5,979.17 = 1,907.67 : x
  2. Step 2: Convert to fraction form
    3,986.19/5,979.17 = 1,907.67/x
  3. Step 3: Cross multiply
    3,986.19x = 5,979.17 × 1,907.67
  4. Step 4: Simplify right side
    3,986.19x = 11,406,273.70
  5. Step 5: Solve for x
    x = 11,406,273.70/3,986.19
  6. Step 6: Final answer
    x = 2,861.45

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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.