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Finding the Fourth Proportional to 18,803.64, 25,889.96 and 15,965.08

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Solution

The fourth proportional to 18,803.64, 25,889.96 and 15,965.08 is: 21,981.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,803.64 : 25,889.96 = 15,965.08 : x
  2. Step 2: Convert to fraction form
    18,803.64/25,889.96 = 15,965.08/x
  3. Step 3: Cross multiply
    18,803.64x = 25,889.96 × 15,965.08
  4. Step 4: Simplify right side
    18,803.64x = 413,335,282.60
  5. Step 5: Solve for x
    x = 413,335,282.60/18,803.64
  6. Step 6: Final answer
    x = 21,981.66

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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.