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Finding the Fourth Proportional to 4,620.99, 6,936.41 and 1,989.79

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Solution

The fourth proportional to 4,620.99, 6,936.41 and 1,989.79 is: 2,986.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,620.99 : 6,936.41 = 1,989.79 : x
  2. Step 2: Convert to fraction form
    4,620.99/6,936.41 = 1,989.79/x
  3. Step 3: Cross multiply
    4,620.99x = 6,936.41 × 1,989.79
  4. Step 4: Simplify right side
    4,620.99x = 13,801,999.25
  5. Step 5: Solve for x
    x = 13,801,999.25/4,620.99
  6. Step 6: Final answer
    x = 2,986.81

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1.5x scale

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.