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Finding the Fourth Proportional to 20,874.72, 28,808.16 and 11,922.72

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Solution

The fourth proportional to 20,874.72, 28,808.16 and 11,922.72 is: 16,453.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.72 : 28,808.16 = 11,922.72 : x
  2. Step 2: Convert to fraction form
    20,874.72/28,808.16 = 11,922.72/x
  3. Step 3: Cross multiply
    20,874.72x = 28,808.16 × 11,922.72
  4. Step 4: Simplify right side
    20,874.72x = 343,471,625.40
  5. Step 5: Solve for x
    x = 343,471,625.40/20,874.72
  6. Step 6: Final answer
    x = 16,453.95

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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.