Home / 2,115.90-2,919.29-1,231.53

Finding the Fourth Proportional to 2,115.90, 2,919.29 and 1,231.53

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Solution

The fourth proportional to 2,115.90, 2,919.29 and 1,231.53 is: 1,699.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.90 : 2,919.29 = 1,231.53 : x
  2. Step 2: Convert to fraction form
    2,115.90/2,919.29 = 1,231.53/x
  3. Step 3: Cross multiply
    2,115.90x = 2,919.29 × 1,231.53
  4. Step 4: Simplify right side
    2,115.90x = 3,595,187.06
  5. Step 5: Solve for x
    x = 3,595,187.06/2,115.90
  6. Step 6: Final answer
    x = 1,699.13

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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.