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Finding the Fourth Proportional to 13,690.37, 18,891.92 and 7,721.68

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Solution

The fourth proportional to 13,690.37, 18,891.92 and 7,721.68 is: 10,655.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.37 : 18,891.92 = 7,721.68 : x
  2. Step 2: Convert to fraction form
    13,690.37/18,891.92 = 7,721.68/x
  3. Step 3: Cross multiply
    13,690.37x = 18,891.92 × 7,721.68
  4. Step 4: Simplify right side
    13,690.37x = 145,877,294.29
  5. Step 5: Solve for x
    x = 145,877,294.29/13,690.37
  6. Step 6: Final answer
    x = 10,655.47

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.