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Finding the Fourth Proportional to 1,383.21, 1,908.78 and 762.21

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Solution

The fourth proportional to 1,383.21, 1,908.78 and 762.21 is: 1,051.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.21 : 1,908.78 = 762.21 : x
  2. Step 2: Convert to fraction form
    1,383.21/1,908.78 = 762.21/x
  3. Step 3: Cross multiply
    1,383.21x = 1,908.78 × 762.21
  4. Step 4: Simplify right side
    1,383.21x = 1,454,891.20
  5. Step 5: Solve for x
    x = 1,454,891.20/1,383.21
  6. Step 6: Final answer
    x = 1,051.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.