Home / 1,778.20-2,454.80-1,115.42

Finding the Fourth Proportional to 1,778.20, 2,454.80 and 1,115.42

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Solution

The fourth proportional to 1,778.20, 2,454.80 and 1,115.42 is: 1,539.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.20 : 2,454.80 = 1,115.42 : x
  2. Step 2: Convert to fraction form
    1,778.20/2,454.80 = 1,115.42/x
  3. Step 3: Cross multiply
    1,778.20x = 2,454.80 × 1,115.42
  4. Step 4: Simplify right side
    1,778.20x = 2,738,115.16
  5. Step 5: Solve for x
    x = 2,738,115.16/1,778.20
  6. Step 6: Final answer
    x = 1,539.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.