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Finding the Fourth Proportional to 1,383.73, 1,909.07 and 879.81

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Solution

The fourth proportional to 1,383.73, 1,909.07 and 879.81 is: 1,213.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.73 : 1,909.07 = 879.81 : x
  2. Step 2: Convert to fraction form
    1,383.73/1,909.07 = 879.81/x
  3. Step 3: Cross multiply
    1,383.73x = 1,909.07 × 879.81
  4. Step 4: Simplify right side
    1,383.73x = 1,679,621.36
  5. Step 5: Solve for x
    x = 1,679,621.36/1,383.73
  6. Step 6: Final answer
    x = 1,213.83

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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.