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Finding the Fourth Proportional to 13,335.63, 20,003.20 and 3,981.99

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Solution

The fourth proportional to 13,335.63, 20,003.20 and 3,981.99 is: 5,972.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,335.63 : 20,003.20 = 3,981.99 : x
  2. Step 2: Convert to fraction form
    13,335.63/20,003.20 = 3,981.99/x
  3. Step 3: Cross multiply
    13,335.63x = 20,003.20 × 3,981.99
  4. Step 4: Simplify right side
    13,335.63x = 79,652,542.37
  5. Step 5: Solve for x
    x = 79,652,542.37/13,335.63
  6. Step 6: Final answer
    x = 5,972.91

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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.