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Finding the Fourth Proportional to 3,980.71, 5,491.02 and 2,721.13

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Solution

The fourth proportional to 3,980.71, 5,491.02 and 2,721.13 is: 3,753.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,980.71 : 5,491.02 = 2,721.13 : x
  2. Step 2: Convert to fraction form
    3,980.71/5,491.02 = 2,721.13/x
  3. Step 3: Cross multiply
    3,980.71x = 5,491.02 × 2,721.13
  4. Step 4: Simplify right side
    3,980.71x = 14,941,775.73
  5. Step 5: Solve for x
    x = 14,941,775.73/3,980.71
  6. Step 6: Final answer
    x = 3,753.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.