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Finding the Fourth Proportional to 6,820.40, 10,228.80 and 2,140.40

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Solution

The fourth proportional to 6,820.40, 10,228.80 and 2,140.40 is: 3,210.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,820.40 : 10,228.80 = 2,140.40 : x
  2. Step 2: Convert to fraction form
    6,820.40/10,228.80 = 2,140.40/x
  3. Step 3: Cross multiply
    6,820.40x = 10,228.80 × 2,140.40
  4. Step 4: Simplify right side
    6,820.40x = 21,893,723.52
  5. Step 5: Solve for x
    x = 21,893,723.52/6,820.40
  6. Step 6: Final answer
    x = 3,210.04

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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.