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Finding the Fourth Proportional to 18,718.78, 28,068.79 and 6,234.41

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Solution

The fourth proportional to 18,718.78, 28,068.79 and 6,234.41 is: 9,348.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.78 : 28,068.79 = 6,234.41 : x
  2. Step 2: Convert to fraction form
    18,718.78/28,068.79 = 6,234.41/x
  3. Step 3: Cross multiply
    18,718.78x = 28,068.79 × 6,234.41
  4. Step 4: Simplify right side
    18,718.78x = 174,992,345.06
  5. Step 5: Solve for x
    x = 174,992,345.06/18,718.78
  6. Step 6: Final answer
    x = 9,348.49

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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.