Home / 3,111.15-4,291.88-1,991.19

Finding the Fourth Proportional to 3,111.15, 4,291.88 and 1,991.19

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Solution

The fourth proportional to 3,111.15, 4,291.88 and 1,991.19 is: 2,746.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.15 : 4,291.88 = 1,991.19 : x
  2. Step 2: Convert to fraction form
    3,111.15/4,291.88 = 1,991.19/x
  3. Step 3: Cross multiply
    3,111.15x = 4,291.88 × 1,991.19
  4. Step 4: Simplify right side
    3,111.15x = 8,545,938.58
  5. Step 5: Solve for x
    x = 8,545,938.58/3,111.15
  6. Step 6: Final answer
    x = 2,746.87

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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.