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Finding the Fourth Proportional to 172.88, 258.72 and 104.38

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Solution

The fourth proportional to 172.88, 258.72 and 104.38 is: 156.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.88 : 258.72 = 104.38 : x
  2. Step 2: Convert to fraction form
    172.88/258.72 = 104.38/x
  3. Step 3: Cross multiply
    172.88x = 258.72 × 104.38
  4. Step 4: Simplify right side
    172.88x = 27,005.19
  5. Step 5: Solve for x
    x = 27,005.19/172.88
  6. Step 6: Final answer
    x = 156.21

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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.