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Finding the Fourth Proportional to 1,678.37, 2,517.63 and 445.80

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Solution

The fourth proportional to 1,678.37, 2,517.63 and 445.80 is: 668.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.37 : 2,517.63 = 445.80 : x
  2. Step 2: Convert to fraction form
    1,678.37/2,517.63 = 445.80/x
  3. Step 3: Cross multiply
    1,678.37x = 2,517.63 × 445.80
  4. Step 4: Simplify right side
    1,678.37x = 1,122,347.55
  5. Step 5: Solve for x
    x = 1,122,347.55/1,678.37
  6. Step 6: Final answer
    x = 668.71

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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.