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Finding the Fourth Proportional to 1,678.35, 2,517.26 and 445.79

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Solution

The fourth proportional to 1,678.35, 2,517.26 and 445.79 is: 668.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.35 : 2,517.26 = 445.79 : x
  2. Step 2: Convert to fraction form
    1,678.35/2,517.26 = 445.79/x
  3. Step 3: Cross multiply
    1,678.35x = 2,517.26 × 445.79
  4. Step 4: Simplify right side
    1,678.35x = 1,122,154.52
  5. Step 5: Solve for x
    x = 1,122,154.52/1,678.35
  6. Step 6: Final answer
    x = 668.61

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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.