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Finding the Fourth Proportional to 18,905.76, 28,391.04 and 18,074.70

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Solution

The fourth proportional to 18,905.76, 28,391.04 and 18,074.70 is: 27,143.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.76 : 28,391.04 = 18,074.70 : x
  2. Step 2: Convert to fraction form
    18,905.76/28,391.04 = 18,074.70/x
  3. Step 3: Cross multiply
    18,905.76x = 28,391.04 × 18,074.70
  4. Step 4: Simplify right side
    18,905.76x = 513,159,530.69
  5. Step 5: Solve for x
    x = 513,159,530.69/18,905.76
  6. Step 6: Final answer
    x = 27,143.03

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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.