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Finding the Fourth Proportional to 420,383.60, 629,538.60 and 279,378.80

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Solution

The fourth proportional to 420,383.60, 629,538.60 and 279,378.80 is: 418,379.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,383.60 : 629,538.60 = 279,378.80 : x
  2. Step 2: Convert to fraction form
    420,383.60/629,538.60 = 279,378.80/x
  3. Step 3: Cross multiply
    420,383.60x = 629,538.60 × 279,378.80
  4. Step 4: Simplify right side
    420,383.60x = 175,879,738,621.68
  5. Step 5: Solve for x
    x = 175,879,738,621.68/420,383.60
  6. Step 6: Final answer
    x = 418,379.16

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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.