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Finding the Fourth Proportional to 15,751.60, 21,738.44 and 8,679.29

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Solution

The fourth proportional to 15,751.60, 21,738.44 and 8,679.29 is: 11,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,751.60 : 21,738.44 = 8,679.29 : x
  2. Step 2: Convert to fraction form
    15,751.60/21,738.44 = 8,679.29/x
  3. Step 3: Cross multiply
    15,751.60x = 21,738.44 × 8,679.29
  4. Step 4: Simplify right side
    15,751.60x = 188,674,224.91
  5. Step 5: Solve for x
    x = 188,674,224.91/15,751.60
  6. Step 6: Final answer
    x = 11,978.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.