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Finding the Fourth Proportional to 1,383.73, 1,910.23 and 911.93

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Solution

The fourth proportional to 1,383.73, 1,910.23 and 911.93 is: 1,258.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.73 : 1,910.23 = 911.93 : x
  2. Step 2: Convert to fraction form
    1,383.73/1,910.23 = 911.93/x
  3. Step 3: Cross multiply
    1,383.73x = 1,910.23 × 911.93
  4. Step 4: Simplify right side
    1,383.73x = 1,741,984.21
  5. Step 5: Solve for x
    x = 1,741,984.21/1,383.73
  6. Step 6: Final answer
    x = 1,258.91

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1.5x scale

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.