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Finding the Fourth Proportional to 172.56, 258.96 and 91.42

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Solution

The fourth proportional to 172.56, 258.96 and 91.42 is: 137.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.56 : 258.96 = 91.42 : x
  2. Step 2: Convert to fraction form
    172.56/258.96 = 91.42/x
  3. Step 3: Cross multiply
    172.56x = 258.96 × 91.42
  4. Step 4: Simplify right side
    172.56x = 23,674.12
  5. Step 5: Solve for x
    x = 23,674.12/172.56
  6. Step 6: Final answer
    x = 137.19

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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.