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Finding the Fourth Proportional to 389.25, 584.15 and 172.85

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Solution

The fourth proportional to 389.25, 584.15 and 172.85 is: 259.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.25 : 584.15 = 172.85 : x
  2. Step 2: Convert to fraction form
    389.25/584.15 = 172.85/x
  3. Step 3: Cross multiply
    389.25x = 584.15 × 172.85
  4. Step 4: Simplify right side
    389.25x = 100,966.54
  5. Step 5: Solve for x
    x = 100,966.54/389.25
  6. Step 6: Final answer
    x = 259.39

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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.