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Finding the Fourth Proportional to 12,486.16, 18,731.94 and 3,721.78

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Solution

The fourth proportional to 12,486.16, 18,731.94 and 3,721.78 is: 5,583.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.16 : 18,731.94 = 3,721.78 : x
  2. Step 2: Convert to fraction form
    12,486.16/18,731.94 = 3,721.78/x
  3. Step 3: Cross multiply
    12,486.16x = 18,731.94 × 3,721.78
  4. Step 4: Simplify right side
    12,486.16x = 69,716,159.65
  5. Step 5: Solve for x
    x = 69,716,159.65/12,486.16
  6. Step 6: Final answer
    x = 5,583.47

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.