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Finding the Fourth Proportional to 285,439.80, 393,107.94 and 279,240.88

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Solution

The fourth proportional to 285,439.80, 393,107.94 and 279,240.88 is: 384,570.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,439.80 : 393,107.94 = 279,240.88 : x
  2. Step 2: Convert to fraction form
    285,439.80/393,107.94 = 279,240.88/x
  3. Step 3: Cross multiply
    285,439.80x = 393,107.94 × 279,240.88
  4. Step 4: Simplify right side
    285,439.80x = 109,771,807,100.59
  5. Step 5: Solve for x
    x = 109,771,807,100.59/285,439.80
  6. Step 6: Final answer
    x = 384,570.78

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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.