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Finding the Fourth Proportional to 393.41, 590.21 and 115.77

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Solution

The fourth proportional to 393.41, 590.21 and 115.77 is: 173.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.41 : 590.21 = 115.77 : x
  2. Step 2: Convert to fraction form
    393.41/590.21 = 115.77/x
  3. Step 3: Cross multiply
    393.41x = 590.21 × 115.77
  4. Step 4: Simplify right side
    393.41x = 68,329.51
  5. Step 5: Solve for x
    x = 68,329.51/393.41
  6. Step 6: Final answer
    x = 173.68

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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.