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Finding the Fourth Proportional to 18,861.96, 28,265.25 and 9,489.10

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Solution

The fourth proportional to 18,861.96, 28,265.25 and 9,489.10 is: 14,219.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.96 : 28,265.25 = 9,489.10 : x
  2. Step 2: Convert to fraction form
    18,861.96/28,265.25 = 9,489.10/x
  3. Step 3: Cross multiply
    18,861.96x = 28,265.25 × 9,489.10
  4. Step 4: Simplify right side
    18,861.96x = 268,211,713.11
  5. Step 5: Solve for x
    x = 268,211,713.11/18,861.96
  6. Step 6: Final answer
    x = 14,219.71

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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.