Home / 2,115.72-2,920.14-1,231.38

Finding the Fourth Proportional to 2,115.72, 2,920.14 and 1,231.38

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Solution

The fourth proportional to 2,115.72, 2,920.14 and 1,231.38 is: 1,699.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.72 : 2,920.14 = 1,231.38 : x
  2. Step 2: Convert to fraction form
    2,115.72/2,920.14 = 1,231.38/x
  3. Step 3: Cross multiply
    2,115.72x = 2,920.14 × 1,231.38
  4. Step 4: Simplify right side
    2,115.72x = 3,595,801.99
  5. Step 5: Solve for x
    x = 3,595,801.99/2,115.72
  6. Step 6: Final answer
    x = 1,699.56

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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.