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Finding the Fourth Proportional to 3,906, 5,390.28 and 2,137.50

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Solution

The fourth proportional to 3,906, 5,390.28 and 2,137.50 is: 2,949.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906 : 5,390.28 = 2,137.50 : x
  2. Step 2: Convert to fraction form
    3,906/5,390.28 = 2,137.50/x
  3. Step 3: Cross multiply
    3,906x = 5,390.28 × 2,137.50
  4. Step 4: Simplify right side
    3,906x = 11,521,723.50
  5. Step 5: Solve for x
    x = 11,521,723.50/3,906
  6. Step 6: Final answer
    x = 2,949.75

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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.