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Finding the Fourth Proportional to 1,578.24, 2,178 and 879.54

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Solution

The fourth proportional to 1,578.24, 2,178 and 879.54 is: 1,213.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.24 : 2,178 = 879.54 : x
  2. Step 2: Convert to fraction form
    1,578.24/2,178 = 879.54/x
  3. Step 3: Cross multiply
    1,578.24x = 2,178 × 879.54
  4. Step 4: Simplify right side
    1,578.24x = 1,915,638.12
  5. Step 5: Solve for x
    x = 1,915,638.12/1,578.24
  6. Step 6: Final answer
    x = 1,213.78

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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.