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Finding the Fourth Proportional to 388.49, 582.60 and 172.22

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Solution

The fourth proportional to 388.49, 582.60 and 172.22 is: 258.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.49 : 582.60 = 172.22 : x
  2. Step 2: Convert to fraction form
    388.49/582.60 = 172.22/x
  3. Step 3: Cross multiply
    388.49x = 582.60 × 172.22
  4. Step 4: Simplify right side
    388.49x = 100,335.37
  5. Step 5: Solve for x
    x = 100,335.37/388.49
  6. Step 6: Final answer
    x = 258.27

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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.