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Finding the Fourth Proportional to 389.26, 583.53 and 172.59

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Solution

The fourth proportional to 389.26, 583.53 and 172.59 is: 258.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.26 : 583.53 = 172.59 : x
  2. Step 2: Convert to fraction form
    389.26/583.53 = 172.59/x
  3. Step 3: Cross multiply
    389.26x = 583.53 × 172.59
  4. Step 4: Simplify right side
    389.26x = 100,711.44
  5. Step 5: Solve for x
    x = 100,711.44/389.26
  6. Step 6: Final answer
    x = 258.73

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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.