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Finding the Fourth Proportional to 172.79, 258.98 and 104.34

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Solution

The fourth proportional to 172.79, 258.98 and 104.34 is: 156.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.79 : 258.98 = 104.34 : x
  2. Step 2: Convert to fraction form
    172.79/258.98 = 104.34/x
  3. Step 3: Cross multiply
    172.79x = 258.98 × 104.34
  4. Step 4: Simplify right side
    172.79x = 27,021.97
  5. Step 5: Solve for x
    x = 27,021.97/172.79
  6. Step 6: Final answer
    x = 156.39

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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.