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Finding the Fourth Proportional to 393.57, 590.39 and 105

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Solution

The fourth proportional to 393.57, 590.39 and 105 is: 157.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.57 : 590.39 = 105 : x
  2. Step 2: Convert to fraction form
    393.57/590.39 = 105/x
  3. Step 3: Cross multiply
    393.57x = 590.39 × 105
  4. Step 4: Simplify right side
    393.57x = 61,990.43
  5. Step 5: Solve for x
    x = 61,990.43/393.57
  6. Step 6: Final answer
    x = 157.51

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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.