Home / 3,999.12-5,513.76-2,991.12

Finding the Fourth Proportional to 3,999.12, 5,513.76 and 2,991.12

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Solution

The fourth proportional to 3,999.12, 5,513.76 and 2,991.12 is: 4,123.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,999.12 : 5,513.76 = 2,991.12 : x
  2. Step 2: Convert to fraction form
    3,999.12/5,513.76 = 2,991.12/x
  3. Step 3: Cross multiply
    3,999.12x = 5,513.76 × 2,991.12
  4. Step 4: Simplify right side
    3,999.12x = 16,492,317.81
  5. Step 5: Solve for x
    x = 16,492,317.81/3,999.12
  6. Step 6: Final answer
    x = 4,123.99

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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.