Home / 5,419.20-8,128.80-1,956

Finding the Fourth Proportional to 5,419.20, 8,128.80 and 1,956

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Solution

The fourth proportional to 5,419.20, 8,128.80 and 1,956 is: 2,934.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.20 : 8,128.80 = 1,956 : x
  2. Step 2: Convert to fraction form
    5,419.20/8,128.80 = 1,956/x
  3. Step 3: Cross multiply
    5,419.20x = 8,128.80 × 1,956
  4. Step 4: Simplify right side
    5,419.20x = 15,899,932.80
  5. Step 5: Solve for x
    x = 15,899,932.80/5,419.20
  6. Step 6: Final answer
    x = 2,934.00

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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.