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Finding the Fourth Proportional to 20,874.80, 28,804.20 and 11,920.88

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Solution

The fourth proportional to 20,874.80, 28,804.20 and 11,920.88 is: 16,449.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.80 : 28,804.20 = 11,920.88 : x
  2. Step 2: Convert to fraction form
    20,874.80/28,804.20 = 11,920.88/x
  3. Step 3: Cross multiply
    20,874.80x = 28,804.20 × 11,920.88
  4. Step 4: Simplify right side
    20,874.80x = 343,371,411.70
  5. Step 5: Solve for x
    x = 343,371,411.70/20,874.80
  6. Step 6: Final answer
    x = 16,449.09

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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.