Home / 2,785.60-4,172.82-1,320.40

Finding the Fourth Proportional to 2,785.60, 4,172.82 and 1,320.40

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Solution

The fourth proportional to 2,785.60, 4,172.82 and 1,320.40 is: 1,977.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,785.60 : 4,172.82 = 1,320.40 : x
  2. Step 2: Convert to fraction form
    2,785.60/4,172.82 = 1,320.40/x
  3. Step 3: Cross multiply
    2,785.60x = 4,172.82 × 1,320.40
  4. Step 4: Simplify right side
    2,785.60x = 5,509,791.53
  5. Step 5: Solve for x
    x = 5,509,791.53/2,785.60
  6. Step 6: Final answer
    x = 1,977.96

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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.