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Finding the Fourth Proportional to 20,874.84, 28,806.21 and 11,920.59

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Solution

The fourth proportional to 20,874.84, 28,806.21 and 11,920.59 is: 16,449.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.84 : 28,806.21 = 11,920.59 : x
  2. Step 2: Convert to fraction form
    20,874.84/28,806.21 = 11,920.59/x
  3. Step 3: Cross multiply
    20,874.84x = 28,806.21 × 11,920.59
  4. Step 4: Simplify right side
    20,874.84x = 343,387,018.86
  5. Step 5: Solve for x
    x = 343,387,018.86/20,874.84
  6. Step 6: Final answer
    x = 16,449.80

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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.