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Finding the Fourth Proportional to 1,391.91, 2,087.88 and 818.43

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Solution

The fourth proportional to 1,391.91, 2,087.88 and 818.43 is: 1,227.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.91 : 2,087.88 = 818.43 : x
  2. Step 2: Convert to fraction form
    1,391.91/2,087.88 = 818.43/x
  3. Step 3: Cross multiply
    1,391.91x = 2,087.88 × 818.43
  4. Step 4: Simplify right side
    1,391.91x = 1,708,783.63
  5. Step 5: Solve for x
    x = 1,708,783.63/1,391.91
  6. Step 6: Final answer
    x = 1,227.65

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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.