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Finding the Fourth Proportional to 69,239.40, 103,640.40 and 54,367.80

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Solution

The fourth proportional to 69,239.40, 103,640.40 and 54,367.80 is: 81,379.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,239.40 : 103,640.40 = 54,367.80 : x
  2. Step 2: Convert to fraction form
    69,239.40/103,640.40 = 54,367.80/x
  3. Step 3: Cross multiply
    69,239.40x = 103,640.40 × 54,367.80
  4. Step 4: Simplify right side
    69,239.40x = 5,634,700,539.12
  5. Step 5: Solve for x
    x = 5,634,700,539.12/69,239.40
  6. Step 6: Final answer
    x = 81,379.97

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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.