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Finding the Fourth Proportional to 18,830.61, 28,245.72 and 4,790.64

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Solution

The fourth proportional to 18,830.61, 28,245.72 and 4,790.64 is: 7,185.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,830.61 : 28,245.72 = 4,790.64 : x
  2. Step 2: Convert to fraction form
    18,830.61/28,245.72 = 4,790.64/x
  3. Step 3: Cross multiply
    18,830.61x = 28,245.72 × 4,790.64
  4. Step 4: Simplify right side
    18,830.61x = 135,315,076.06
  5. Step 5: Solve for x
    x = 135,315,076.06/18,830.61
  6. Step 6: Final answer
    x = 7,185.91

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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.