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Finding the Fourth Proportional to 69,991.57, 104,965.81 and 20,058.28

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Solution

The fourth proportional to 69,991.57, 104,965.81 and 20,058.28 is: 30,081.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,991.57 : 104,965.81 = 20,058.28 : x
  2. Step 2: Convert to fraction form
    69,991.57/104,965.81 = 20,058.28/x
  3. Step 3: Cross multiply
    69,991.57x = 104,965.81 × 20,058.28
  4. Step 4: Simplify right side
    69,991.57x = 2,105,433,607.41
  5. Step 5: Solve for x
    x = 2,105,433,607.41/69,991.57
  6. Step 6: Final answer
    x = 30,081.25

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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.