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Finding the Fourth Proportional to 3,405.75, 4,699.78 and 1,989.51

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Solution

The fourth proportional to 3,405.75, 4,699.78 and 1,989.51 is: 2,745.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.75 : 4,699.78 = 1,989.51 : x
  2. Step 2: Convert to fraction form
    3,405.75/4,699.78 = 1,989.51/x
  3. Step 3: Cross multiply
    3,405.75x = 4,699.78 × 1,989.51
  4. Step 4: Simplify right side
    3,405.75x = 9,350,249.36
  5. Step 5: Solve for x
    x = 9,350,249.36/3,405.75
  6. Step 6: Final answer
    x = 2,745.43

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1.5x scale

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.