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Finding the Fourth Proportional to 1,338.98, 2,008.22 and 414.42

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Solution

The fourth proportional to 1,338.98, 2,008.22 and 414.42 is: 621.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.98 : 2,008.22 = 414.42 : x
  2. Step 2: Convert to fraction form
    1,338.98/2,008.22 = 414.42/x
  3. Step 3: Cross multiply
    1,338.98x = 2,008.22 × 414.42
  4. Step 4: Simplify right side
    1,338.98x = 832,246.53
  5. Step 5: Solve for x
    x = 832,246.53/1,338.98
  6. Step 6: Final answer
    x = 621.55

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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.