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Finding the Fourth Proportional to 13,138, 19,707 and 3,904

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Solution

The fourth proportional to 13,138, 19,707 and 3,904 is: 5,856

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138 : 19,707 = 3,904 : x
  2. Step 2: Convert to fraction form
    13,138/19,707 = 3,904/x
  3. Step 3: Cross multiply
    13,138x = 19,707 × 3,904
  4. Step 4: Simplify right side
    13,138x = 76,936,128
  5. Step 5: Solve for x
    x = 76,936,128/13,138
  6. Step 6: Final answer
    x = 5,856

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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.