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Finding the Fourth Proportional to 20,589.63, 28,405.57 and 13,427.89

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Solution

The fourth proportional to 20,589.63, 28,405.57 and 13,427.89 is: 18,525.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,589.63 : 28,405.57 = 13,427.89 : x
  2. Step 2: Convert to fraction form
    20,589.63/28,405.57 = 13,427.89/x
  3. Step 3: Cross multiply
    20,589.63x = 28,405.57 × 13,427.89
  4. Step 4: Simplify right side
    20,589.63x = 381,426,869.35
  5. Step 5: Solve for x
    x = 381,426,869.35/20,589.63
  6. Step 6: Final answer
    x = 18,525.19

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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.