Home / 3,320.10-4,979.80-1,128.78

Finding the Fourth Proportional to 3,320.10, 4,979.80 and 1,128.78

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Solution

The fourth proportional to 3,320.10, 4,979.80 and 1,128.78 is: 1,693.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,320.10 : 4,979.80 = 1,128.78 : x
  2. Step 2: Convert to fraction form
    3,320.10/4,979.80 = 1,128.78/x
  3. Step 3: Cross multiply
    3,320.10x = 4,979.80 × 1,128.78
  4. Step 4: Simplify right side
    3,320.10x = 5,621,098.64
  5. Step 5: Solve for x
    x = 5,621,098.64/3,320.10
  6. Step 6: Final answer
    x = 1,693.05

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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.