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Finding the Fourth Proportional to 1,357.21, 1,872.97 and 797.69

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Solution

The fourth proportional to 1,357.21, 1,872.97 and 797.69 is: 1,100.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.21 : 1,872.97 = 797.69 : x
  2. Step 2: Convert to fraction form
    1,357.21/1,872.97 = 797.69/x
  3. Step 3: Cross multiply
    1,357.21x = 1,872.97 × 797.69
  4. Step 4: Simplify right side
    1,357.21x = 1,494,052.13
  5. Step 5: Solve for x
    x = 1,494,052.13/1,357.21
  6. Step 6: Final answer
    x = 1,100.83

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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.