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Finding the Fourth Proportional to 1,218.36, 1,828.62 and 871.68

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Solution

The fourth proportional to 1,218.36, 1,828.62 and 871.68 is: 1,308.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.36 : 1,828.62 = 871.68 : x
  2. Step 2: Convert to fraction form
    1,218.36/1,828.62 = 871.68/x
  3. Step 3: Cross multiply
    1,218.36x = 1,828.62 × 871.68
  4. Step 4: Simplify right side
    1,218.36x = 1,593,971.48
  5. Step 5: Solve for x
    x = 1,593,971.48/1,218.36
  6. Step 6: Final answer
    x = 1,308.29

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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.