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Finding the Fourth Proportional to 28,717.52, 43,076.28 and 12,290

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Solution

The fourth proportional to 28,717.52, 43,076.28 and 12,290 is: 18,435

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,717.52 : 43,076.28 = 12,290 : x
  2. Step 2: Convert to fraction form
    28,717.52/43,076.28 = 12,290/x
  3. Step 3: Cross multiply
    28,717.52x = 43,076.28 × 12,290
  4. Step 4: Simplify right side
    28,717.52x = 529,407,481.20
  5. Step 5: Solve for x
    x = 529,407,481.20/28,717.52
  6. Step 6: Final answer
    x = 18,435

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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.