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Finding the Fourth Proportional to 28,481.88, 42,743.70 and 10,729.20

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Solution

The fourth proportional to 28,481.88, 42,743.70 and 10,729.20 is: 16,101.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,481.88 : 42,743.70 = 10,729.20 : x
  2. Step 2: Convert to fraction form
    28,481.88/42,743.70 = 10,729.20/x
  3. Step 3: Cross multiply
    28,481.88x = 42,743.70 × 10,729.20
  4. Step 4: Simplify right side
    28,481.88x = 458,605,706.04
  5. Step 5: Solve for x
    x = 458,605,706.04/28,481.88
  6. Step 6: Final answer
    x = 16,101.67

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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.