Home / 2,911.80-4,367.70-2,785.40

Finding the Fourth Proportional to 2,911.80, 4,367.70 and 2,785.40

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Solution

The fourth proportional to 2,911.80, 4,367.70 and 2,785.40 is: 4,178.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,911.80 : 4,367.70 = 2,785.40 : x
  2. Step 2: Convert to fraction form
    2,911.80/4,367.70 = 2,785.40/x
  3. Step 3: Cross multiply
    2,911.80x = 4,367.70 × 2,785.40
  4. Step 4: Simplify right side
    2,911.80x = 12,165,791.58
  5. Step 5: Solve for x
    x = 12,165,791.58/2,911.80
  6. Step 6: Final answer
    x = 4,178.10

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1.5x scale

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.