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Finding the Fourth Proportional to 18,906.56, 28,362.18 and 6,428.64

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Solution

The fourth proportional to 18,906.56, 28,362.18 and 6,428.64 is: 9,643.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.56 : 28,362.18 = 6,428.64 : x
  2. Step 2: Convert to fraction form
    18,906.56/28,362.18 = 6,428.64/x
  3. Step 3: Cross multiply
    18,906.56x = 28,362.18 × 6,428.64
  4. Step 4: Simplify right side
    18,906.56x = 182,330,244.84
  5. Step 5: Solve for x
    x = 182,330,244.84/18,906.56
  6. Step 6: Final answer
    x = 9,643.76

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1.5x scale

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.