Home / 2,115.40-2,919.18-1,231.15

Finding the Fourth Proportional to 2,115.40, 2,919.18 and 1,231.15

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Solution

The fourth proportional to 2,115.40, 2,919.18 and 1,231.15 is: 1,698.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.40 : 2,919.18 = 1,231.15 : x
  2. Step 2: Convert to fraction form
    2,115.40/2,919.18 = 1,231.15/x
  3. Step 3: Cross multiply
    2,115.40x = 2,919.18 × 1,231.15
  4. Step 4: Simplify right side
    2,115.40x = 3,593,948.46
  5. Step 5: Solve for x
    x = 3,593,948.46/2,115.40
  6. Step 6: Final answer
    x = 1,698.95

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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.