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Finding the Fourth Proportional to 71,722.65, 107,581.20 and 19,131.68

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Solution

The fourth proportional to 71,722.65, 107,581.20 and 19,131.68 is: 28,696.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,722.65 : 107,581.20 = 19,131.68 : x
  2. Step 2: Convert to fraction form
    71,722.65/107,581.20 = 19,131.68/x
  3. Step 3: Cross multiply
    71,722.65x = 107,581.20 × 19,131.68
  4. Step 4: Simplify right side
    71,722.65x = 2,058,208,554.51
  5. Step 5: Solve for x
    x = 2,058,208,554.51/71,722.65
  6. Step 6: Final answer
    x = 28,696.77

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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.