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Finding the Fourth Proportional to 2,205.47, 3,308.21 and 818.81

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Solution

The fourth proportional to 2,205.47, 3,308.21 and 818.81 is: 1,228.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,205.47 : 3,308.21 = 818.81 : x
  2. Step 2: Convert to fraction form
    2,205.47/3,308.21 = 818.81/x
  3. Step 3: Cross multiply
    2,205.47x = 3,308.21 × 818.81
  4. Step 4: Simplify right side
    2,205.47x = 2,708,774.80
  5. Step 5: Solve for x
    x = 2,708,774.80/2,205.47
  6. Step 6: Final answer
    x = 1,228.21

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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.