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Finding the Fourth Proportional to 318,643.70, 477,965.55 and 279,245.30

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Solution

The fourth proportional to 318,643.70, 477,965.55 and 279,245.30 is: 418,867.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,643.70 : 477,965.55 = 279,245.30 : x
  2. Step 2: Convert to fraction form
    318,643.70/477,965.55 = 279,245.30/x
  3. Step 3: Cross multiply
    318,643.70x = 477,965.55 × 279,245.30
  4. Step 4: Simplify right side
    318,643.70x = 133,469,633,399.42
  5. Step 5: Solve for x
    x = 133,469,633,399.42/318,643.70
  6. Step 6: Final answer
    x = 418,867.95

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Similar ratio
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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.