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Finding the Fourth Proportional to 20,874.86, 28,809.30 and 11,923.70

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Solution

The fourth proportional to 20,874.86, 28,809.30 and 11,923.70 is: 16,455.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.86 : 28,809.30 = 11,923.70 : x
  2. Step 2: Convert to fraction form
    20,874.86/28,809.30 = 11,923.70/x
  3. Step 3: Cross multiply
    20,874.86x = 28,809.30 × 11,923.70
  4. Step 4: Simplify right side
    20,874.86x = 343,513,450.41
  5. Step 5: Solve for x
    x = 343,513,450.41/20,874.86
  6. Step 6: Final answer
    x = 16,455.84

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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.