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Finding the Fourth Proportional to 18,558.96, 25,620.12 and 11,490

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Solution

The fourth proportional to 18,558.96, 25,620.12 and 11,490 is: 15,861.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,558.96 : 25,620.12 = 11,490 : x
  2. Step 2: Convert to fraction form
    18,558.96/25,620.12 = 11,490/x
  3. Step 3: Cross multiply
    18,558.96x = 25,620.12 × 11,490
  4. Step 4: Simplify right side
    18,558.96x = 294,375,178.80
  5. Step 5: Solve for x
    x = 294,375,178.80/18,558.96
  6. Step 6: Final answer
    x = 15,861.62

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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.