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Finding the Fourth Proportional to 18,181.64, 25,081.80 and 12,879.20

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Solution

The fourth proportional to 18,181.64, 25,081.80 and 12,879.20 is: 17,767.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,181.64 : 25,081.80 = 12,879.20 : x
  2. Step 2: Convert to fraction form
    18,181.64/25,081.80 = 12,879.20/x
  3. Step 3: Cross multiply
    18,181.64x = 25,081.80 × 12,879.20
  4. Step 4: Simplify right side
    18,181.64x = 323,033,518.56
  5. Step 5: Solve for x
    x = 323,033,518.56/18,181.64
  6. Step 6: Final answer
    x = 17,767.02

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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.