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Finding the Fourth Proportional to 12,864, 19,297.80 and 3,980.06

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Solution

The fourth proportional to 12,864, 19,297.80 and 3,980.06 is: 5,970.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,864 : 19,297.80 = 3,980.06 : x
  2. Step 2: Convert to fraction form
    12,864/19,297.80 = 3,980.06/x
  3. Step 3: Cross multiply
    12,864x = 19,297.80 × 3,980.06
  4. Step 4: Simplify right side
    12,864x = 76,806,401.87
  5. Step 5: Solve for x
    x = 76,806,401.87/12,864
  6. Step 6: Final answer
    x = 5,970.65

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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.