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Finding the Fourth Proportional to 1,261.58, 1,891.83 and 395.69

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Solution

The fourth proportional to 1,261.58, 1,891.83 and 395.69 is: 593.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.58 : 1,891.83 = 395.69 : x
  2. Step 2: Convert to fraction form
    1,261.58/1,891.83 = 395.69/x
  3. Step 3: Cross multiply
    1,261.58x = 1,891.83 × 395.69
  4. Step 4: Simplify right side
    1,261.58x = 748,578.21
  5. Step 5: Solve for x
    x = 748,578.21/1,261.58
  6. Step 6: Final answer
    x = 593.37

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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.