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Finding the Fourth Proportional to 3,186.80, 4,779.84 and 878

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Solution

The fourth proportional to 3,186.80, 4,779.84 and 878 is: 1,316.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,186.80 : 4,779.84 = 878 : x
  2. Step 2: Convert to fraction form
    3,186.80/4,779.84 = 878/x
  3. Step 3: Cross multiply
    3,186.80x = 4,779.84 × 878
  4. Step 4: Simplify right side
    3,186.80x = 4,196,699.52
  5. Step 5: Solve for x
    x = 4,196,699.52/3,186.80
  6. Step 6: Final answer
    x = 1,316.90

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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.