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Finding the Fourth Proportional to 3,906, 5,390.28 and 2,912.13

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Solution

The fourth proportional to 3,906, 5,390.28 and 2,912.13 is: 4,018.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906 : 5,390.28 = 2,912.13 : x
  2. Step 2: Convert to fraction form
    3,906/5,390.28 = 2,912.13/x
  3. Step 3: Cross multiply
    3,906x = 5,390.28 × 2,912.13
  4. Step 4: Simplify right side
    3,906x = 15,697,196.10
  5. Step 5: Solve for x
    x = 15,697,196.10/3,906
  6. Step 6: Final answer
    x = 4,018.74

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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.