Home / 5,178.90-7,768.80-1,620.78

Finding the Fourth Proportional to 5,178.90, 7,768.80 and 1,620.78

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Solution

The fourth proportional to 5,178.90, 7,768.80 and 1,620.78 is: 2,431.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,178.90 : 7,768.80 = 1,620.78 : x
  2. Step 2: Convert to fraction form
    5,178.90/7,768.80 = 1,620.78/x
  3. Step 3: Cross multiply
    5,178.90x = 7,768.80 × 1,620.78
  4. Step 4: Simplify right side
    5,178.90x = 12,591,515.66
  5. Step 5: Solve for x
    x = 12,591,515.66/5,178.90
  6. Step 6: Final answer
    x = 2,431.31

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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.