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Finding the Fourth Proportional to 1,351.54, 1,863.99 and 879.21

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Solution

The fourth proportional to 1,351.54, 1,863.99 and 879.21 is: 1,212.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.54 : 1,863.99 = 879.21 : x
  2. Step 2: Convert to fraction form
    1,351.54/1,863.99 = 879.21/x
  3. Step 3: Cross multiply
    1,351.54x = 1,863.99 × 879.21
  4. Step 4: Simplify right side
    1,351.54x = 1,638,838.65
  5. Step 5: Solve for x
    x = 1,638,838.65/1,351.54
  6. Step 6: Final answer
    x = 1,212.57

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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.