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Finding the Fourth Proportional to 389.39, 584.18 and 115.47

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Solution

The fourth proportional to 389.39, 584.18 and 115.47 is: 173.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.39 : 584.18 = 115.47 : x
  2. Step 2: Convert to fraction form
    389.39/584.18 = 115.47/x
  3. Step 3: Cross multiply
    389.39x = 584.18 × 115.47
  4. Step 4: Simplify right side
    389.39x = 67,455.26
  5. Step 5: Solve for x
    x = 67,455.26/389.39
  6. Step 6: Final answer
    x = 173.23

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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.