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Finding the Fourth Proportional to 258.74, 388.25 and 172.14

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Solution

The fourth proportional to 258.74, 388.25 and 172.14 is: 258.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.74 : 388.25 = 172.14 : x
  2. Step 2: Convert to fraction form
    258.74/388.25 = 172.14/x
  3. Step 3: Cross multiply
    258.74x = 388.25 × 172.14
  4. Step 4: Simplify right side
    258.74x = 66,831.95
  5. Step 5: Solve for x
    x = 66,831.95/258.74
  6. Step 6: Final answer
    x = 258.30

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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.