Home / 2,115.70-2,919.60-1,231.78

Finding the Fourth Proportional to 2,115.70, 2,919.60 and 1,231.78

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Solution

The fourth proportional to 2,115.70, 2,919.60 and 1,231.78 is: 1,699.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.70 : 2,919.60 = 1,231.78 : x
  2. Step 2: Convert to fraction form
    2,115.70/2,919.60 = 1,231.78/x
  3. Step 3: Cross multiply
    2,115.70x = 2,919.60 × 1,231.78
  4. Step 4: Simplify right side
    2,115.70x = 3,596,304.89
  5. Step 5: Solve for x
    x = 3,596,304.89/2,115.70
  6. Step 6: Final answer
    x = 1,699.82

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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.