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Finding the Fourth Proportional to 13,690.64, 18,891.47 and 7,721.96

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Solution

The fourth proportional to 13,690.64, 18,891.47 and 7,721.96 is: 10,655.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.64 : 18,891.47 = 7,721.96 : x
  2. Step 2: Convert to fraction form
    13,690.64/18,891.47 = 7,721.96/x
  3. Step 3: Cross multiply
    13,690.64x = 18,891.47 × 7,721.96
  4. Step 4: Simplify right side
    13,690.64x = 145,879,042.61
  5. Step 5: Solve for x
    x = 145,879,042.61/13,690.64
  6. Step 6: Final answer
    x = 10,655.39

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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.