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Finding the Fourth Proportional to 15,861.56, 21,889.44 and 8,788.64

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Solution

The fourth proportional to 15,861.56, 21,889.44 and 8,788.64 is: 12,128.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.56 : 21,889.44 = 8,788.64 : x
  2. Step 2: Convert to fraction form
    15,861.56/21,889.44 = 8,788.64/x
  3. Step 3: Cross multiply
    15,861.56x = 21,889.44 × 8,788.64
  4. Step 4: Simplify right side
    15,861.56x = 192,378,298.51
  5. Step 5: Solve for x
    x = 192,378,298.51/15,861.56
  6. Step 6: Final answer
    x = 12,128.59

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1.5x scale

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.