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Finding the Fourth Proportional to 12,879.82, 19,310.28 and 4,109.68

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Solution

The fourth proportional to 12,879.82, 19,310.28 and 4,109.68 is: 6,161.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.82 : 19,310.28 = 4,109.68 : x
  2. Step 2: Convert to fraction form
    12,879.82/19,310.28 = 4,109.68/x
  3. Step 3: Cross multiply
    12,879.82x = 19,310.28 × 4,109.68
  4. Step 4: Simplify right side
    12,879.82x = 79,359,071.51
  5. Step 5: Solve for x
    x = 79,359,071.51/12,879.82
  6. Step 6: Final answer
    x = 6,161.50

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1.5x scale

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.