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Finding the Fourth Proportional to 20,806.54, 28,713.42 and 11,853.54

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Solution

The fourth proportional to 20,806.54, 28,713.42 and 11,853.54 is: 16,358.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.54 : 28,713.42 = 11,853.54 : x
  2. Step 2: Convert to fraction form
    20,806.54/28,713.42 = 11,853.54/x
  3. Step 3: Cross multiply
    20,806.54x = 28,713.42 × 11,853.54
  4. Step 4: Simplify right side
    20,806.54x = 340,355,672.51
  5. Step 5: Solve for x
    x = 340,355,672.51/20,806.54
  6. Step 6: Final answer
    x = 16,358.11

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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.