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Finding the Fourth Proportional to 18,771.48, 28,128.87 and 12,509.37

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Solution

The fourth proportional to 18,771.48, 28,128.87 and 12,509.37 is: 18,745.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.48 : 28,128.87 = 12,509.37 : x
  2. Step 2: Convert to fraction form
    18,771.48/28,128.87 = 12,509.37/x
  3. Step 3: Cross multiply
    18,771.48x = 28,128.87 × 12,509.37
  4. Step 4: Simplify right side
    18,771.48x = 351,874,442.51
  5. Step 5: Solve for x
    x = 351,874,442.51/18,771.48
  6. Step 6: Final answer
    x = 18,745.16

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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.