Home / 2,115.23-2,919.10-1,405.85

Finding the Fourth Proportional to 2,115.23, 2,919.10 and 1,405.85

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Solution

The fourth proportional to 2,115.23, 2,919.10 and 1,405.85 is: 1,940.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.23 : 2,919.10 = 1,405.85 : x
  2. Step 2: Convert to fraction form
    2,115.23/2,919.10 = 1,405.85/x
  3. Step 3: Cross multiply
    2,115.23x = 2,919.10 × 1,405.85
  4. Step 4: Simplify right side
    2,115.23x = 4,103,816.74
  5. Step 5: Solve for x
    x = 4,103,816.74/2,115.23
  6. Step 6: Final answer
    x = 1,940.13

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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.