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Finding the Fourth Proportional to 18,665.42, 28,004.06 and 5,517.86

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Solution

The fourth proportional to 18,665.42, 28,004.06 and 5,517.86 is: 8,278.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,665.42 : 28,004.06 = 5,517.86 : x
  2. Step 2: Convert to fraction form
    18,665.42/28,004.06 = 5,517.86/x
  3. Step 3: Cross multiply
    18,665.42x = 28,004.06 × 5,517.86
  4. Step 4: Simplify right side
    18,665.42x = 154,522,482.51
  5. Step 5: Solve for x
    x = 154,522,482.51/18,665.42
  6. Step 6: Final answer
    x = 8,278.54

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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.