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Finding the Fourth Proportional to 18,741.20, 28,111.80 and 4,890.20

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Solution

The fourth proportional to 18,741.20, 28,111.80 and 4,890.20 is: 7,335.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,741.20 : 28,111.80 = 4,890.20 : x
  2. Step 2: Convert to fraction form
    18,741.20/28,111.80 = 4,890.20/x
  3. Step 3: Cross multiply
    18,741.20x = 28,111.80 × 4,890.20
  4. Step 4: Simplify right side
    18,741.20x = 137,472,183.80
  5. Step 5: Solve for x
    x = 137,472,183.80/18,741.20
  6. Step 6: Final answer
    x = 7,335.29

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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.