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Finding the Fourth Proportional to 1,392.26, 2,087.96 and 418.12

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Solution

The fourth proportional to 1,392.26, 2,087.96 and 418.12 is: 627.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.26 : 2,087.96 = 418.12 : x
  2. Step 2: Convert to fraction form
    1,392.26/2,087.96 = 418.12/x
  3. Step 3: Cross multiply
    1,392.26x = 2,087.96 × 418.12
  4. Step 4: Simplify right side
    1,392.26x = 873,017.84
  5. Step 5: Solve for x
    x = 873,017.84/1,392.26
  6. Step 6: Final answer
    x = 627.05

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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.