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Finding the Fourth Proportional to 12,879.50, 19,319.25 and 3,645.50

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Solution

The fourth proportional to 12,879.50, 19,319.25 and 3,645.50 is: 5,468.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.50 : 19,319.25 = 3,645.50 : x
  2. Step 2: Convert to fraction form
    12,879.50/19,319.25 = 3,645.50/x
  3. Step 3: Cross multiply
    12,879.50x = 19,319.25 × 3,645.50
  4. Step 4: Simplify right side
    12,879.50x = 70,428,325.88
  5. Step 5: Solve for x
    x = 70,428,325.88/12,879.50
  6. Step 6: Final answer
    x = 5,468.25

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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.