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Finding the Fourth Proportional to 1,383.41, 1,908.93 and 823.90

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Solution

The fourth proportional to 1,383.41, 1,908.93 and 823.90 is: 1,136.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.41 : 1,908.93 = 823.90 : x
  2. Step 2: Convert to fraction form
    1,383.41/1,908.93 = 823.90/x
  3. Step 3: Cross multiply
    1,383.41x = 1,908.93 × 823.90
  4. Step 4: Simplify right side
    1,383.41x = 1,572,767.43
  5. Step 5: Solve for x
    x = 1,572,767.43/1,383.41
  6. Step 6: Final answer
    x = 1,136.88

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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.