Home / 2,115.18-2,920.39-1,318.83

Finding the Fourth Proportional to 2,115.18, 2,920.39 and 1,318.83

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Solution

The fourth proportional to 2,115.18, 2,920.39 and 1,318.83 is: 1,820.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.18 : 2,920.39 = 1,318.83 : x
  2. Step 2: Convert to fraction form
    2,115.18/2,920.39 = 1,318.83/x
  3. Step 3: Cross multiply
    2,115.18x = 2,920.39 × 1,318.83
  4. Step 4: Simplify right side
    2,115.18x = 3,851,497.94
  5. Step 5: Solve for x
    x = 3,851,497.94/2,115.18
  6. Step 6: Final answer
    x = 1,820.88

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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.