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Finding the Fourth Proportional to 1,272.45, 1,908.49 and 439.65

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Solution

The fourth proportional to 1,272.45, 1,908.49 and 439.65 is: 659.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.45 : 1,908.49 = 439.65 : x
  2. Step 2: Convert to fraction form
    1,272.45/1,908.49 = 439.65/x
  3. Step 3: Cross multiply
    1,272.45x = 1,908.49 × 439.65
  4. Step 4: Simplify right side
    1,272.45x = 839,067.63
  5. Step 5: Solve for x
    x = 839,067.63/1,272.45
  6. Step 6: Final answer
    x = 659.41

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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.