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Finding the Fourth Proportional to 30,409.08, 45,618.42 and 12,879

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Solution

The fourth proportional to 30,409.08, 45,618.42 and 12,879 is: 19,320.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,409.08 : 45,618.42 = 12,879 : x
  2. Step 2: Convert to fraction form
    30,409.08/45,618.42 = 12,879/x
  3. Step 3: Cross multiply
    30,409.08x = 45,618.42 × 12,879
  4. Step 4: Simplify right side
    30,409.08x = 587,519,631.18
  5. Step 5: Solve for x
    x = 587,519,631.18/30,409.08
  6. Step 6: Final answer
    x = 19,320.53

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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.