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Finding the Fourth Proportional to 1,261.18, 1,891.78 and 383.82

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Solution

The fourth proportional to 1,261.18, 1,891.78 and 383.82 is: 575.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.18 : 1,891.78 = 383.82 : x
  2. Step 2: Convert to fraction form
    1,261.18/1,891.78 = 383.82/x
  3. Step 3: Cross multiply
    1,261.18x = 1,891.78 × 383.82
  4. Step 4: Simplify right side
    1,261.18x = 726,102.04
  5. Step 5: Solve for x
    x = 726,102.04/1,261.18
  6. Step 6: Final answer
    x = 575.73

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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.