Home / 3,320.80-4,977.80-1,128.12

Finding the Fourth Proportional to 3,320.80, 4,977.80 and 1,128.12

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Solution

The fourth proportional to 3,320.80, 4,977.80 and 1,128.12 is: 1,691.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.80 : 4,977.80 = 1,128.12 : x
  2. Step 2: Convert to fraction form
    3,320.80/4,977.80 = 1,128.12/x
  3. Step 3: Cross multiply
    3,320.80x = 4,977.80 × 1,128.12
  4. Step 4: Simplify right side
    3,320.80x = 5,615,555.74
  5. Step 5: Solve for x
    x = 5,615,555.74/3,320.80
  6. Step 6: Final answer
    x = 1,691.02

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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.