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Finding the Fourth Proportional to 30,418.48, 45,619.80 and 12,879.28

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Solution

The fourth proportional to 30,418.48, 45,619.80 and 12,879.28 is: 19,315.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,418.48 : 45,619.80 = 12,879.28 : x
  2. Step 2: Convert to fraction form
    30,418.48/45,619.80 = 12,879.28/x
  3. Step 3: Cross multiply
    30,418.48x = 45,619.80 × 12,879.28
  4. Step 4: Simplify right side
    30,418.48x = 587,550,177.74
  5. Step 5: Solve for x
    x = 587,550,177.74/30,418.48
  6. Step 6: Final answer
    x = 19,315.57

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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.