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Finding the Fourth Proportional to 3,759.69, 5,639.40 and 986.34

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Solution

The fourth proportional to 3,759.69, 5,639.40 and 986.34 is: 1,479.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,759.69 : 5,639.40 = 986.34 : x
  2. Step 2: Convert to fraction form
    3,759.69/5,639.40 = 986.34/x
  3. Step 3: Cross multiply
    3,759.69x = 5,639.40 × 986.34
  4. Step 4: Simplify right side
    3,759.69x = 5,562,365.80
  5. Step 5: Solve for x
    x = 5,562,365.80/3,759.69
  6. Step 6: Final answer
    x = 1,479.47

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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.