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Finding the Fourth Proportional to 69,721.80, 104,801.40 and 68,409.60

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Solution

The fourth proportional to 69,721.80, 104,801.40 and 68,409.60 is: 102,828.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,721.80 : 104,801.40 = 68,409.60 : x
  2. Step 2: Convert to fraction form
    69,721.80/104,801.40 = 68,409.60/x
  3. Step 3: Cross multiply
    69,721.80x = 104,801.40 × 68,409.60
  4. Step 4: Simplify right side
    69,721.80x = 7,169,421,853.44
  5. Step 5: Solve for x
    x = 7,169,421,853.44/69,721.80
  6. Step 6: Final answer
    x = 102,828.98

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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.