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Finding the Fourth Proportional to 172.75, 259.16 and 91.58

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Solution

The fourth proportional to 172.75, 259.16 and 91.58 is: 137.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.75 : 259.16 = 91.58 : x
  2. Step 2: Convert to fraction form
    172.75/259.16 = 91.58/x
  3. Step 3: Cross multiply
    172.75x = 259.16 × 91.58
  4. Step 4: Simplify right side
    172.75x = 23,732.81
  5. Step 5: Solve for x
    x = 23,732.81/172.75
  6. Step 6: Final answer
    x = 137.38

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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.