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Finding the Fourth Proportional to 355.09, 532.79 and 172.49

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Solution

The fourth proportional to 355.09, 532.79 and 172.49 is: 258.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.09 : 532.79 = 172.49 : x
  2. Step 2: Convert to fraction form
    355.09/532.79 = 172.49/x
  3. Step 3: Cross multiply
    355.09x = 532.79 × 172.49
  4. Step 4: Simplify right side
    355.09x = 91,897.58
  5. Step 5: Solve for x
    x = 91,897.58/355.09
  6. Step 6: Final answer
    x = 258.80

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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.