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Finding the Fourth Proportional to 389.48, 584.21 and 115.66

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Solution

The fourth proportional to 389.48, 584.21 and 115.66 is: 173.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.48 : 584.21 = 115.66 : x
  2. Step 2: Convert to fraction form
    389.48/584.21 = 115.66/x
  3. Step 3: Cross multiply
    389.48x = 584.21 × 115.66
  4. Step 4: Simplify right side
    389.48x = 67,570.75
  5. Step 5: Solve for x
    x = 67,570.75/389.48
  6. Step 6: Final answer
    x = 173.49

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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.