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Finding the Fourth Proportional to 28,978.28, 39,975.90 and 18,236.46

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Solution

The fourth proportional to 28,978.28, 39,975.90 and 18,236.46 is: 25,157.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.28 : 39,975.90 = 18,236.46 : x
  2. Step 2: Convert to fraction form
    28,978.28/39,975.90 = 18,236.46/x
  3. Step 3: Cross multiply
    28,978.28x = 39,975.90 × 18,236.46
  4. Step 4: Simplify right side
    28,978.28x = 729,018,982.84
  5. Step 5: Solve for x
    x = 729,018,982.84/28,978.28
  6. Step 6: Final answer
    x = 25,157.43

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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.