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Finding the Fourth Proportional to 172.48, 258.63 and 128.29

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Solution

The fourth proportional to 172.48, 258.63 and 128.29 is: 192.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.48 : 258.63 = 128.29 : x
  2. Step 2: Convert to fraction form
    172.48/258.63 = 128.29/x
  3. Step 3: Cross multiply
    172.48x = 258.63 × 128.29
  4. Step 4: Simplify right side
    172.48x = 33,179.64
  5. Step 5: Solve for x
    x = 33,179.64/172.48
  6. Step 6: Final answer
    x = 192.37

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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.