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Finding the Fourth Proportional to 18,861.63, 28,265.63 and 13,892.19

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Solution

The fourth proportional to 18,861.63, 28,265.63 and 13,892.19 is: 20,818.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.63 : 28,265.63 = 13,892.19 : x
  2. Step 2: Convert to fraction form
    18,861.63/28,265.63 = 13,892.19/x
  3. Step 3: Cross multiply
    18,861.63x = 28,265.63 × 13,892.19
  4. Step 4: Simplify right side
    18,861.63x = 392,671,432.97
  5. Step 5: Solve for x
    x = 392,671,432.97/18,861.63
  6. Step 6: Final answer
    x = 20,818.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.