Home / 2,785.80-4,178.70-1,403.40

Finding the Fourth Proportional to 2,785.80, 4,178.70 and 1,403.40

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Solution

The fourth proportional to 2,785.80, 4,178.70 and 1,403.40 is: 2,105.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,785.80 : 4,178.70 = 1,403.40 : x
  2. Step 2: Convert to fraction form
    2,785.80/4,178.70 = 1,403.40/x
  3. Step 3: Cross multiply
    2,785.80x = 4,178.70 × 1,403.40
  4. Step 4: Simplify right side
    2,785.80x = 5,864,387.58
  5. Step 5: Solve for x
    x = 5,864,387.58/2,785.80
  6. Step 6: Final answer
    x = 2,105.10

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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.