Home / 2,115.36-2,919.11-1,231.20

Finding the Fourth Proportional to 2,115.36, 2,919.11 and 1,231.20

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Solution

The fourth proportional to 2,115.36, 2,919.11 and 1,231.20 is: 1,699.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.36 : 2,919.11 = 1,231.20 : x
  2. Step 2: Convert to fraction form
    2,115.36/2,919.11 = 1,231.20/x
  3. Step 3: Cross multiply
    2,115.36x = 2,919.11 × 1,231.20
  4. Step 4: Simplify right side
    2,115.36x = 3,594,002.08
  5. Step 5: Solve for x
    x = 3,594,002.08/2,115.36
  6. Step 6: Final answer
    x = 1,699.00

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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.