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Finding the Fourth Proportional to 28,719, 43,078.50 and 7,942.50

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Solution

The fourth proportional to 28,719, 43,078.50 and 7,942.50 is: 11,913.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,719 : 43,078.50 = 7,942.50 : x
  2. Step 2: Convert to fraction form
    28,719/43,078.50 = 7,942.50/x
  3. Step 3: Cross multiply
    28,719x = 43,078.50 × 7,942.50
  4. Step 4: Simplify right side
    28,719x = 342,150,986.25
  5. Step 5: Solve for x
    x = 342,150,986.25/28,719
  6. Step 6: Final answer
    x = 11,913.75

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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.