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Finding the Fourth Proportional to 172.66, 258.50 and 91.32

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Solution

The fourth proportional to 172.66, 258.50 and 91.32 is: 136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.66 : 258.50 = 91.32 : x
  2. Step 2: Convert to fraction form
    172.66/258.50 = 91.32/x
  3. Step 3: Cross multiply
    172.66x = 258.50 × 91.32
  4. Step 4: Simplify right side
    172.66x = 23,606.22
  5. Step 5: Solve for x
    x = 23,606.22/172.66
  6. Step 6: Final answer
    x = 136.72

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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.