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Finding the Fourth Proportional to 389.51, 584.12 and 115.60

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Solution

The fourth proportional to 389.51, 584.12 and 115.60 is: 173.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.51 : 584.12 = 115.60 : x
  2. Step 2: Convert to fraction form
    389.51/584.12 = 115.60/x
  3. Step 3: Cross multiply
    389.51x = 584.12 × 115.60
  4. Step 4: Simplify right side
    389.51x = 67,523.10
  5. Step 5: Solve for x
    x = 67,523.10/389.51
  6. Step 6: Final answer
    x = 173.36

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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.