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Finding the Fourth Proportional to 20,756.64, 28,643.94 and 11,325

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Solution

The fourth proportional to 20,756.64, 28,643.94 and 11,325 is: 15,628.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,756.64 : 28,643.94 = 11,325 : x
  2. Step 2: Convert to fraction form
    20,756.64/28,643.94 = 11,325/x
  3. Step 3: Cross multiply
    20,756.64x = 28,643.94 × 11,325
  4. Step 4: Simplify right side
    20,756.64x = 324,392,620.50
  5. Step 5: Solve for x
    x = 324,392,620.50/20,756.64
  6. Step 6: Final answer
    x = 15,628.38

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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.