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Finding the Fourth Proportional to 18,879.71, 28,319.79 and 8,203.59

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Solution

The fourth proportional to 18,879.71, 28,319.79 and 8,203.59 is: 12,305.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.71 : 28,319.79 = 8,203.59 : x
  2. Step 2: Convert to fraction form
    18,879.71/28,319.79 = 8,203.59/x
  3. Step 3: Cross multiply
    18,879.71x = 28,319.79 × 8,203.59
  4. Step 4: Simplify right side
    18,879.71x = 232,323,946.05
  5. Step 5: Solve for x
    x = 232,323,946.05/18,879.71
  6. Step 6: Final answer
    x = 12,305.48

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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.