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Finding the Fourth Proportional to 1,272.06, 1,908 and 394.50

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Solution

The fourth proportional to 1,272.06, 1,908 and 394.50 is: 591.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.06 : 1,908 = 394.50 : x
  2. Step 2: Convert to fraction form
    1,272.06/1,908 = 394.50/x
  3. Step 3: Cross multiply
    1,272.06x = 1,908 × 394.50
  4. Step 4: Simplify right side
    1,272.06x = 752,706
  5. Step 5: Solve for x
    x = 752,706/1,272.06
  6. Step 6: Final answer
    x = 591.72

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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.