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Finding the Fourth Proportional to 1,272.03, 1,908.23 and 394.61

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Solution

The fourth proportional to 1,272.03, 1,908.23 and 394.61 is: 591.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.03 : 1,908.23 = 394.61 : x
  2. Step 2: Convert to fraction form
    1,272.03/1,908.23 = 394.61/x
  3. Step 3: Cross multiply
    1,272.03x = 1,908.23 × 394.61
  4. Step 4: Simplify right side
    1,272.03x = 752,995.13
  5. Step 5: Solve for x
    x = 752,995.13/1,272.03
  6. Step 6: Final answer
    x = 591.97

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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.