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Finding the Fourth Proportional to 74,138.72, 111,208.80 and 18,734.72

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Solution

The fourth proportional to 74,138.72, 111,208.80 and 18,734.72 is: 28,102.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,138.72 : 111,208.80 = 18,734.72 : x
  2. Step 2: Convert to fraction form
    74,138.72/111,208.80 = 18,734.72/x
  3. Step 3: Cross multiply
    74,138.72x = 111,208.80 × 18,734.72
  4. Step 4: Simplify right side
    74,138.72x = 2,083,465,729.54
  5. Step 5: Solve for x
    x = 2,083,465,729.54/74,138.72
  6. Step 6: Final answer
    x = 28,102.26

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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.