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Finding the Fourth Proportional to 74,379.21, 111,568.77 and 18,975.21

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Solution

The fourth proportional to 74,379.21, 111,568.77 and 18,975.21 is: 28,462.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,379.21 : 111,568.77 = 18,975.21 : x
  2. Step 2: Convert to fraction form
    74,379.21/111,568.77 = 18,975.21/x
  3. Step 3: Cross multiply
    74,379.21x = 111,568.77 × 18,975.21
  4. Step 4: Simplify right side
    74,379.21x = 2,117,040,840.19
  5. Step 5: Solve for x
    x = 2,117,040,840.19/74,379.21
  6. Step 6: Final answer
    x = 28,462.80

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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.