Home / 3,936.78-5,905.08-1,988.46

Finding the Fourth Proportional to 3,936.78, 5,905.08 and 1,988.46

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Solution

The fourth proportional to 3,936.78, 5,905.08 and 1,988.46 is: 2,982.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.78 : 5,905.08 = 1,988.46 : x
  2. Step 2: Convert to fraction form
    3,936.78/5,905.08 = 1,988.46/x
  3. Step 3: Cross multiply
    3,936.78x = 5,905.08 × 1,988.46
  4. Step 4: Simplify right side
    3,936.78x = 11,742,015.38
  5. Step 5: Solve for x
    x = 11,742,015.38/3,936.78
  6. Step 6: Final answer
    x = 2,982.64

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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.