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Finding the Fourth Proportional to 13,686.56, 18,887.47 and 8,020.18

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Solution

The fourth proportional to 13,686.56, 18,887.47 and 8,020.18 is: 11,067.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,686.56 : 18,887.47 = 8,020.18 : x
  2. Step 2: Convert to fraction form
    13,686.56/18,887.47 = 8,020.18/x
  3. Step 3: Cross multiply
    13,686.56x = 18,887.47 × 8,020.18
  4. Step 4: Simplify right side
    13,686.56x = 151,480,909.14
  5. Step 5: Solve for x
    x = 151,480,909.14/13,686.56
  6. Step 6: Final answer
    x = 11,067.86

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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.