Home / 3,111.84-4,292.10-2,115.38

Finding the Fourth Proportional to 3,111.84, 4,292.10 and 2,115.38

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Solution

The fourth proportional to 3,111.84, 4,292.10 and 2,115.38 is: 2,917.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.84 : 4,292.10 = 2,115.38 : x
  2. Step 2: Convert to fraction form
    3,111.84/4,292.10 = 2,115.38/x
  3. Step 3: Cross multiply
    3,111.84x = 4,292.10 × 2,115.38
  4. Step 4: Simplify right side
    3,111.84x = 9,079,422.50
  5. Step 5: Solve for x
    x = 9,079,422.50/3,111.84
  6. Step 6: Final answer
    x = 2,917.70

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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.