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Finding the Fourth Proportional to 69,243.72, 103,879.55 and 21,866.21

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Solution

The fourth proportional to 69,243.72, 103,879.55 and 21,866.21 is: 32,803.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,243.72 : 103,879.55 = 21,866.21 : x
  2. Step 2: Convert to fraction form
    69,243.72/103,879.55 = 21,866.21/x
  3. Step 3: Cross multiply
    69,243.72x = 103,879.55 × 21,866.21
  4. Step 4: Simplify right side
    69,243.72x = 2,271,452,055.01
  5. Step 5: Solve for x
    x = 2,271,452,055.01/69,243.72
  6. Step 6: Final answer
    x = 32,803.73

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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.