Home / 5,431-8,140.99-2,139.57

Finding the Fourth Proportional to 5,431, 8,140.99 and 2,139.57

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Solution

The fourth proportional to 5,431, 8,140.99 and 2,139.57 is: 3,207.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,431 : 8,140.99 = 2,139.57 : x
  2. Step 2: Convert to fraction form
    5,431/8,140.99 = 2,139.57/x
  3. Step 3: Cross multiply
    5,431x = 8,140.99 × 2,139.57
  4. Step 4: Simplify right side
    5,431x = 17,418,217.97
  5. Step 5: Solve for x
    x = 17,418,217.97/5,431
  6. Step 6: Final answer
    x = 3,207.18

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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.