Home / 3,431.40-5,139.90-2,855.40

Finding the Fourth Proportional to 3,431.40, 5,139.90 and 2,855.40

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Solution

The fourth proportional to 3,431.40, 5,139.90 and 2,855.40 is: 4,277.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,431.40 : 5,139.90 = 2,855.40 : x
  2. Step 2: Convert to fraction form
    3,431.40/5,139.90 = 2,855.40/x
  3. Step 3: Cross multiply
    3,431.40x = 5,139.90 × 2,855.40
  4. Step 4: Simplify right side
    3,431.40x = 14,676,470.46
  5. Step 5: Solve for x
    x = 14,676,470.46/3,431.40
  6. Step 6: Final answer
    x = 4,277.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.