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Finding the Fourth Proportional to 3,428.88, 5,138.28 and 1,868.64

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Solution

The fourth proportional to 3,428.88, 5,138.28 and 1,868.64 is: 2,800.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.88 : 5,138.28 = 1,868.64 : x
  2. Step 2: Convert to fraction form
    3,428.88/5,138.28 = 1,868.64/x
  3. Step 3: Cross multiply
    3,428.88x = 5,138.28 × 1,868.64
  4. Step 4: Simplify right side
    3,428.88x = 9,601,595.54
  5. Step 5: Solve for x
    x = 9,601,595.54/3,428.88
  6. Step 6: Final answer
    x = 2,800.21

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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.