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Finding the Fourth Proportional to 1,272.87, 1,908.09 and 541.44

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Solution

The fourth proportional to 1,272.87, 1,908.09 and 541.44 is: 811.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.87 : 1,908.09 = 541.44 : x
  2. Step 2: Convert to fraction form
    1,272.87/1,908.09 = 541.44/x
  3. Step 3: Cross multiply
    1,272.87x = 1,908.09 × 541.44
  4. Step 4: Simplify right side
    1,272.87x = 1,033,116.25
  5. Step 5: Solve for x
    x = 1,033,116.25/1,272.87
  6. Step 6: Final answer
    x = 811.64

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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.