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Finding the Fourth Proportional to 18,690.30, 28,040.87 and 5,542.99

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Solution

The fourth proportional to 18,690.30, 28,040.87 and 5,542.99 is: 8,316.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.30 : 28,040.87 = 5,542.99 : x
  2. Step 2: Convert to fraction form
    18,690.30/28,040.87 = 5,542.99/x
  3. Step 3: Cross multiply
    18,690.30x = 28,040.87 × 5,542.99
  4. Step 4: Simplify right side
    18,690.30x = 155,430,262.00
  5. Step 5: Solve for x
    x = 155,430,262.00/18,690.30
  6. Step 6: Final answer
    x = 8,316.09

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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.