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Finding the Fourth Proportional to 20,638.44, 28,480.86 and 11,206.44

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Solution

The fourth proportional to 20,638.44, 28,480.86 and 11,206.44 is: 15,464.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.44 : 28,480.86 = 11,206.44 : x
  2. Step 2: Convert to fraction form
    20,638.44/28,480.86 = 11,206.44/x
  3. Step 3: Cross multiply
    20,638.44x = 28,480.86 × 11,206.44
  4. Step 4: Simplify right side
    20,638.44x = 319,169,048.74
  5. Step 5: Solve for x
    x = 319,169,048.74/20,638.44
  6. Step 6: Final answer
    x = 15,464.79

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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.