Home / 5,427.80-8,140.10-2,139.80

Finding the Fourth Proportional to 5,427.80, 8,140.10 and 2,139.80

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Solution

The fourth proportional to 5,427.80, 8,140.10 and 2,139.80 is: 3,209.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,427.80 : 8,140.10 = 2,139.80 : x
  2. Step 2: Convert to fraction form
    5,427.80/8,140.10 = 2,139.80/x
  3. Step 3: Cross multiply
    5,427.80x = 8,140.10 × 2,139.80
  4. Step 4: Simplify right side
    5,427.80x = 17,418,185.98
  5. Step 5: Solve for x
    x = 17,418,185.98/5,427.80
  6. Step 6: Final answer
    x = 3,209.07

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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.