Home / 5,428.30-8,140.77-2,142.40

Finding the Fourth Proportional to 5,428.30, 8,140.77 and 2,142.40

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Solution

The fourth proportional to 5,428.30, 8,140.77 and 2,142.40 is: 3,212.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.30 : 8,140.77 = 2,142.40 : x
  2. Step 2: Convert to fraction form
    5,428.30/8,140.77 = 2,142.40/x
  3. Step 3: Cross multiply
    5,428.30x = 8,140.77 × 2,142.40
  4. Step 4: Simplify right side
    5,428.30x = 17,440,785.65
  5. Step 5: Solve for x
    x = 17,440,785.65/5,428.30
  6. Step 6: Final answer
    x = 3,212.94

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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.