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Finding the Fourth Proportional to 2,028.78, 3,039.12 and 931.64

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Solution

The fourth proportional to 2,028.78, 3,039.12 and 931.64 is: 1,395.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,028.78 : 3,039.12 = 931.64 : x
  2. Step 2: Convert to fraction form
    2,028.78/3,039.12 = 931.64/x
  3. Step 3: Cross multiply
    2,028.78x = 3,039.12 × 931.64
  4. Step 4: Simplify right side
    2,028.78x = 2,831,350.56
  5. Step 5: Solve for x
    x = 2,831,350.56/2,028.78
  6. Step 6: Final answer
    x = 1,395.59

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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.