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Finding the Fourth Proportional to 20,874.41, 28,805.60 and 11,920.16

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Solution

The fourth proportional to 20,874.41, 28,805.60 and 11,920.16 is: 16,449.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.41 : 28,805.60 = 11,920.16 : x
  2. Step 2: Convert to fraction form
    20,874.41/28,805.60 = 11,920.16/x
  3. Step 3: Cross multiply
    20,874.41x = 28,805.60 × 11,920.16
  4. Step 4: Simplify right side
    20,874.41x = 343,367,246.67
  5. Step 5: Solve for x
    x = 343,367,246.67/20,874.41
  6. Step 6: Final answer
    x = 16,449.20

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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.