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Finding the Fourth Proportional to 69,640.20, 104,460.90 and 19,721.40

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Solution

The fourth proportional to 69,640.20, 104,460.90 and 19,721.40 is: 29,582.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,640.20 : 104,460.90 = 19,721.40 : x
  2. Step 2: Convert to fraction form
    69,640.20/104,460.90 = 19,721.40/x
  3. Step 3: Cross multiply
    69,640.20x = 104,460.90 × 19,721.40
  4. Step 4: Simplify right side
    69,640.20x = 2,060,115,193.26
  5. Step 5: Solve for x
    x = 2,060,115,193.26/69,640.20
  6. Step 6: Final answer
    x = 29,582.27

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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.