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Finding the Fourth Proportional to 20,894.68, 28,819.86 and 12,940.84

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Solution

The fourth proportional to 20,894.68, 28,819.86 and 12,940.84 is: 17,849.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,894.68 : 28,819.86 = 12,940.84 : x
  2. Step 2: Convert to fraction form
    20,894.68/28,819.86 = 12,940.84/x
  3. Step 3: Cross multiply
    20,894.68x = 28,819.86 × 12,940.84
  4. Step 4: Simplify right side
    20,894.68x = 372,953,197.08
  5. Step 5: Solve for x
    x = 372,953,197.08/20,894.68
  6. Step 6: Final answer
    x = 17,849.19

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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.