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Finding the Fourth Proportional to 3,920.81, 5,395.21 and 3,618.88

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Solution

The fourth proportional to 3,920.81, 5,395.21 and 3,618.88 is: 4,979.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.81 : 5,395.21 = 3,618.88 : x
  2. Step 2: Convert to fraction form
    3,920.81/5,395.21 = 3,618.88/x
  3. Step 3: Cross multiply
    3,920.81x = 5,395.21 × 3,618.88
  4. Step 4: Simplify right side
    3,920.81x = 19,524,595.03
  5. Step 5: Solve for x
    x = 19,524,595.03/3,920.81
  6. Step 6: Final answer
    x = 4,979.74

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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.