Home / 3,191.40-4,406.40-2,311.20

Finding the Fourth Proportional to 3,191.40, 4,406.40 and 2,311.20

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Solution

The fourth proportional to 3,191.40, 4,406.40 and 2,311.20 is: 3,191.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,191.40 : 4,406.40 = 2,311.20 : x
  2. Step 2: Convert to fraction form
    3,191.40/4,406.40 = 2,311.20/x
  3. Step 3: Cross multiply
    3,191.40x = 4,406.40 × 2,311.20
  4. Step 4: Simplify right side
    3,191.40x = 10,184,071.68
  5. Step 5: Solve for x
    x = 10,184,071.68/3,191.40
  6. Step 6: Final answer
    x = 3,191.10

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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.