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Finding the Fourth Proportional to 28,481.48, 42,731.36 and 13,691.48

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Solution

The fourth proportional to 28,481.48, 42,731.36 and 13,691.48 is: 20,541.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,481.48 : 42,731.36 = 13,691.48 : x
  2. Step 2: Convert to fraction form
    28,481.48/42,731.36 = 13,691.48/x
  3. Step 3: Cross multiply
    28,481.48x = 42,731.36 × 13,691.48
  4. Step 4: Simplify right side
    28,481.48x = 585,055,560.81
  5. Step 5: Solve for x
    x = 585,055,560.81/28,481.48
  6. Step 6: Final answer
    x = 20,541.61

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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.