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Finding the Fourth Proportional to 172.22, 258.12 and 91.02

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Solution

The fourth proportional to 172.22, 258.12 and 91.02 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.22 : 258.12 = 91.02 : x
  2. Step 2: Convert to fraction form
    172.22/258.12 = 91.02/x
  3. Step 3: Cross multiply
    172.22x = 258.12 × 91.02
  4. Step 4: Simplify right side
    172.22x = 23,494.08
  5. Step 5: Solve for x
    x = 23,494.08/172.22
  6. Step 6: Final answer
    x = 136.42

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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.