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Finding the Fourth Proportional to 18,745.78, 28,118.67 and 4,894.66

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Solution

The fourth proportional to 18,745.78, 28,118.67 and 4,894.66 is: 7,341.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.78 : 28,118.67 = 4,894.66 : x
  2. Step 2: Convert to fraction form
    18,745.78/28,118.67 = 4,894.66/x
  3. Step 3: Cross multiply
    18,745.78x = 28,118.67 × 4,894.66
  4. Step 4: Simplify right side
    18,745.78x = 137,631,329.30
  5. Step 5: Solve for x
    x = 137,631,329.30/18,745.78
  6. Step 6: Final answer
    x = 7,341.99

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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.