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Finding the Fourth Proportional to 18,956.78, 28,435.91 and 5,629.74

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Solution

The fourth proportional to 18,956.78, 28,435.91 and 5,629.74 is: 8,444.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.78 : 28,435.91 = 5,629.74 : x
  2. Step 2: Convert to fraction form
    18,956.78/28,435.91 = 5,629.74/x
  3. Step 3: Cross multiply
    18,956.78x = 28,435.91 × 5,629.74
  4. Step 4: Simplify right side
    18,956.78x = 160,086,751.81
  5. Step 5: Solve for x
    x = 160,086,751.81/18,956.78
  6. Step 6: Final answer
    x = 8,444.83

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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.