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Finding the Fourth Proportional to 905.74, 1,357.66 and 385.62

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Solution

The fourth proportional to 905.74, 1,357.66 and 385.62 is: 578.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.74 : 1,357.66 = 385.62 : x
  2. Step 2: Convert to fraction form
    905.74/1,357.66 = 385.62/x
  3. Step 3: Cross multiply
    905.74x = 1,357.66 × 385.62
  4. Step 4: Simplify right side
    905.74x = 523,540.85
  5. Step 5: Solve for x
    x = 523,540.85/905.74
  6. Step 6: Final answer
    x = 578.03

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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.