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Finding the Fourth Proportional to 18,478.64, 27,709.72 and 5,327.89

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Solution

The fourth proportional to 18,478.64, 27,709.72 and 5,327.89 is: 7,989.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,478.64 : 27,709.72 = 5,327.89 : x
  2. Step 2: Convert to fraction form
    18,478.64/27,709.72 = 5,327.89/x
  3. Step 3: Cross multiply
    18,478.64x = 27,709.72 × 5,327.89
  4. Step 4: Simplify right side
    18,478.64x = 147,634,340.09
  5. Step 5: Solve for x
    x = 147,634,340.09/18,478.64
  6. Step 6: Final answer
    x = 7,989.46

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Why These Related Problems?

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