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Finding the Fourth Proportional to 28,758, 43,137 and 7,981.50

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Solution

The fourth proportional to 28,758, 43,137 and 7,981.50 is: 11,972.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,758 : 43,137 = 7,981.50 : x
  2. Step 2: Convert to fraction form
    28,758/43,137 = 7,981.50/x
  3. Step 3: Cross multiply
    28,758x = 43,137 × 7,981.50
  4. Step 4: Simplify right side
    28,758x = 344,297,965.50
  5. Step 5: Solve for x
    x = 344,297,965.50/28,758
  6. Step 6: Final answer
    x = 11,972.25

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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.