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Finding the Fourth Proportional to 18,231.68, 25,160.64 and 11,156

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Solution

The fourth proportional to 18,231.68, 25,160.64 and 11,156 is: 15,395.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,231.68 : 25,160.64 = 11,156 : x
  2. Step 2: Convert to fraction form
    18,231.68/25,160.64 = 11,156/x
  3. Step 3: Cross multiply
    18,231.68x = 25,160.64 × 11,156
  4. Step 4: Simplify right side
    18,231.68x = 280,692,099.84
  5. Step 5: Solve for x
    x = 280,692,099.84/18,231.68
  6. Step 6: Final answer
    x = 15,395.84

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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.