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Finding the Fourth Proportional to 28,805, 43,207.50 and 12,389

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Solution

The fourth proportional to 28,805, 43,207.50 and 12,389 is: 18,583.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,805 : 43,207.50 = 12,389 : x
  2. Step 2: Convert to fraction form
    28,805/43,207.50 = 12,389/x
  3. Step 3: Cross multiply
    28,805x = 43,207.50 × 12,389
  4. Step 4: Simplify right side
    28,805x = 535,297,717.50
  5. Step 5: Solve for x
    x = 535,297,717.50/28,805
  6. Step 6: Final answer
    x = 18,583.50

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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.