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Finding the Fourth Proportional to 18,944.64, 28,416.98 and 8,412.19

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Solution

The fourth proportional to 18,944.64, 28,416.98 and 8,412.19 is: 12,618.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,944.64 : 28,416.98 = 8,412.19 : x
  2. Step 2: Convert to fraction form
    18,944.64/28,416.98 = 8,412.19/x
  3. Step 3: Cross multiply
    18,944.64x = 28,416.98 × 8,412.19
  4. Step 4: Simplify right side
    18,944.64x = 239,048,984.97
  5. Step 5: Solve for x
    x = 239,048,984.97/18,944.64
  6. Step 6: Final answer
    x = 12,618.29

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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.