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Finding the Fourth Proportional to 258.41, 388.38 and 172.04

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Solution

The fourth proportional to 258.41, 388.38 and 172.04 is: 258.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.41 : 388.38 = 172.04 : x
  2. Step 2: Convert to fraction form
    258.41/388.38 = 172.04/x
  3. Step 3: Cross multiply
    258.41x = 388.38 × 172.04
  4. Step 4: Simplify right side
    258.41x = 66,814.95
  5. Step 5: Solve for x
    x = 66,814.95/258.41
  6. Step 6: Final answer
    x = 258.57

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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.