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Finding the Fourth Proportional to 1,238.76, 1,855.10 and 871.83

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Solution

The fourth proportional to 1,238.76, 1,855.10 and 871.83 is: 1,305.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.76 : 1,855.10 = 871.83 : x
  2. Step 2: Convert to fraction form
    1,238.76/1,855.10 = 871.83/x
  3. Step 3: Cross multiply
    1,238.76x = 1,855.10 × 871.83
  4. Step 4: Simplify right side
    1,238.76x = 1,617,334.01
  5. Step 5: Solve for x
    x = 1,617,334.01/1,238.76
  6. Step 6: Final answer
    x = 1,305.61

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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.