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Finding the Fourth Proportional to 3,280.80, 4,917.20 and 2,240.80

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Solution

The fourth proportional to 3,280.80, 4,917.20 and 2,240.80 is: 3,358.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.80 : 4,917.20 = 2,240.80 : x
  2. Step 2: Convert to fraction form
    3,280.80/4,917.20 = 2,240.80/x
  3. Step 3: Cross multiply
    3,280.80x = 4,917.20 × 2,240.80
  4. Step 4: Simplify right side
    3,280.80x = 11,018,461.76
  5. Step 5: Solve for x
    x = 11,018,461.76/3,280.80
  6. Step 6: Final answer
    x = 3,358.47

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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.