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Finding the Fourth Proportional to 18,741, 28,111.77 and 4,890

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Solution

The fourth proportional to 18,741, 28,111.77 and 4,890 is: 7,335.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,741 : 28,111.77 = 4,890 : x
  2. Step 2: Convert to fraction form
    18,741/28,111.77 = 4,890/x
  3. Step 3: Cross multiply
    18,741x = 28,111.77 × 4,890
  4. Step 4: Simplify right side
    18,741x = 137,466,555.30
  5. Step 5: Solve for x
    x = 137,466,555.30/18,741
  6. Step 6: Final answer
    x = 7,335.07

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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.