Home / 3,422.78-5,135.40-1,780.10

Finding the Fourth Proportional to 3,422.78, 5,135.40 and 1,780.10

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Solution

The fourth proportional to 3,422.78, 5,135.40 and 1,780.10 is: 2,670.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,422.78 : 5,135.40 = 1,780.10 : x
  2. Step 2: Convert to fraction form
    3,422.78/5,135.40 = 1,780.10/x
  3. Step 3: Cross multiply
    3,422.78x = 5,135.40 × 1,780.10
  4. Step 4: Simplify right side
    3,422.78x = 9,141,525.54
  5. Step 5: Solve for x
    x = 9,141,525.54/3,422.78
  6. Step 6: Final answer
    x = 2,670.79

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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.