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Finding the Fourth Proportional to 1,392.39, 2,087.96 and 418.57

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Solution

The fourth proportional to 1,392.39, 2,087.96 and 418.57 is: 627.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.39 : 2,087.96 = 418.57 : x
  2. Step 2: Convert to fraction form
    1,392.39/2,087.96 = 418.57/x
  3. Step 3: Cross multiply
    1,392.39x = 2,087.96 × 418.57
  4. Step 4: Simplify right side
    1,392.39x = 873,957.42
  5. Step 5: Solve for x
    x = 873,957.42/1,392.39
  6. Step 6: Final answer
    x = 627.67

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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.