Home / 2,778.18-4,165.11-1,390.80

Finding the Fourth Proportional to 2,778.18, 4,165.11 and 1,390.80

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Solution

The fourth proportional to 2,778.18, 4,165.11 and 1,390.80 is: 2,085.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778.18 : 4,165.11 = 1,390.80 : x
  2. Step 2: Convert to fraction form
    2,778.18/4,165.11 = 1,390.80/x
  3. Step 3: Cross multiply
    2,778.18x = 4,165.11 × 1,390.80
  4. Step 4: Simplify right side
    2,778.18x = 5,792,850.61
  5. Step 5: Solve for x
    x = 5,792,850.61/2,778.18
  6. Step 6: Final answer
    x = 2,085.12

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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.