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Finding the Fourth Proportional to 18,989.54, 28,433.05 and 12,736.09

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Solution

The fourth proportional to 18,989.54, 28,433.05 and 12,736.09 is: 19,069.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.54 : 28,433.05 = 12,736.09 : x
  2. Step 2: Convert to fraction form
    18,989.54/28,433.05 = 12,736.09/x
  3. Step 3: Cross multiply
    18,989.54x = 28,433.05 × 12,736.09
  4. Step 4: Simplify right side
    18,989.54x = 362,125,763.36
  5. Step 5: Solve for x
    x = 362,125,763.36/18,989.54
  6. Step 6: Final answer
    x = 19,069.75

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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.