Home / 2,807.20-4,210.80-2,778.40

Finding the Fourth Proportional to 2,807.20, 4,210.80 and 2,778.40

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Solution

The fourth proportional to 2,807.20, 4,210.80 and 2,778.40 is: 4,167.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.20 : 4,210.80 = 2,778.40 : x
  2. Step 2: Convert to fraction form
    2,807.20/4,210.80 = 2,778.40/x
  3. Step 3: Cross multiply
    2,807.20x = 4,210.80 × 2,778.40
  4. Step 4: Simplify right side
    2,807.20x = 11,699,286.72
  5. Step 5: Solve for x
    x = 11,699,286.72/2,807.20
  6. Step 6: Final answer
    x = 4,167.60

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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.