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Finding the Fourth Proportional to 28,243.20, 38,978 and 15,672

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Solution

The fourth proportional to 28,243.20, 38,978 and 15,672 is: 21,628.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,243.20 : 38,978 = 15,672 : x
  2. Step 2: Convert to fraction form
    28,243.20/38,978 = 15,672/x
  3. Step 3: Cross multiply
    28,243.20x = 38,978 × 15,672
  4. Step 4: Simplify right side
    28,243.20x = 610,863,216
  5. Step 5: Solve for x
    x = 610,863,216/28,243.20
  6. Step 6: Final answer
    x = 21,628.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.