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Finding the Fourth Proportional to 1,238.09, 1,855.09 and 871.09

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Solution

The fourth proportional to 1,238.09, 1,855.09 and 871.09 is: 1,305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.09 : 1,855.09 = 871.09 : x
  2. Step 2: Convert to fraction form
    1,238.09/1,855.09 = 871.09/x
  3. Step 3: Cross multiply
    1,238.09x = 1,855.09 × 871.09
  4. Step 4: Simplify right side
    1,238.09x = 1,615,950.35
  5. Step 5: Solve for x
    x = 1,615,950.35/1,238.09
  6. Step 6: Final answer
    x = 1,305.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.