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Finding the Fourth Proportional to 12,478.63, 18,721.02 and 3,713.51

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Solution

The fourth proportional to 12,478.63, 18,721.02 and 3,713.51 is: 5,571.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.63 : 18,721.02 = 3,713.51 : x
  2. Step 2: Convert to fraction form
    12,478.63/18,721.02 = 3,713.51/x
  3. Step 3: Cross multiply
    12,478.63x = 18,721.02 × 3,713.51
  4. Step 4: Simplify right side
    12,478.63x = 69,520,694.98
  5. Step 5: Solve for x
    x = 69,520,694.98/12,478.63
  6. Step 6: Final answer
    x = 5,571.18

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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.