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Finding the Fourth Proportional to 28,185.87, 38,879.40 and 18,625.86

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Solution

The fourth proportional to 28,185.87, 38,879.40 and 18,625.86 is: 25,692.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,185.87 : 38,879.40 = 18,625.86 : x
  2. Step 2: Convert to fraction form
    28,185.87/38,879.40 = 18,625.86/x
  3. Step 3: Cross multiply
    28,185.87x = 38,879.40 × 18,625.86
  4. Step 4: Simplify right side
    28,185.87x = 724,162,261.28
  5. Step 5: Solve for x
    x = 724,162,261.28/28,185.87
  6. Step 6: Final answer
    x = 25,692.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.