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Finding the Fourth Proportional to 1,389.14, 1,917.01 and 799.79

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Solution

The fourth proportional to 1,389.14, 1,917.01 and 799.79 is: 1,103.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.14 : 1,917.01 = 799.79 : x
  2. Step 2: Convert to fraction form
    1,389.14/1,917.01 = 799.79/x
  3. Step 3: Cross multiply
    1,389.14x = 1,917.01 × 799.79
  4. Step 4: Simplify right side
    1,389.14x = 1,533,205.43
  5. Step 5: Solve for x
    x = 1,533,205.43/1,389.14
  6. Step 6: Final answer
    x = 1,103.71

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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.