Home / 3,991.21-5,507.84-2,312.58

Finding the Fourth Proportional to 3,991.21, 5,507.84 and 2,312.58

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Solution

The fourth proportional to 3,991.21, 5,507.84 and 2,312.58 is: 3,191.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.21 : 5,507.84 = 2,312.58 : x
  2. Step 2: Convert to fraction form
    3,991.21/5,507.84 = 2,312.58/x
  3. Step 3: Cross multiply
    3,991.21x = 5,507.84 × 2,312.58
  4. Step 4: Simplify right side
    3,991.21x = 12,737,309.06
  5. Step 5: Solve for x
    x = 12,737,309.06/3,991.21
  6. Step 6: Final answer
    x = 3,191.34

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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.