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Finding the Fourth Proportional to 1,728.42, 2,591.96 and 617.78

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Solution

The fourth proportional to 1,728.42, 2,591.96 and 617.78 is: 926.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.42 : 2,591.96 = 617.78 : x
  2. Step 2: Convert to fraction form
    1,728.42/2,591.96 = 617.78/x
  3. Step 3: Cross multiply
    1,728.42x = 2,591.96 × 617.78
  4. Step 4: Simplify right side
    1,728.42x = 1,601,245.00
  5. Step 5: Solve for x
    x = 1,601,245.00/1,728.42
  6. Step 6: Final answer
    x = 926.42

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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.