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Finding the Fourth Proportional to 1,052.12, 1,578.19 and 393.97

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Solution

The fourth proportional to 1,052.12, 1,578.19 and 393.97 is: 590.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,052.12 : 1,578.19 = 393.97 : x
  2. Step 2: Convert to fraction form
    1,052.12/1,578.19 = 393.97/x
  3. Step 3: Cross multiply
    1,052.12x = 1,578.19 × 393.97
  4. Step 4: Simplify right side
    1,052.12x = 621,764.39
  5. Step 5: Solve for x
    x = 621,764.39/1,052.12
  6. Step 6: Final answer
    x = 590.96

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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.