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Finding the Fourth Proportional to 172.16, 236.99 and 130.61

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Solution

The fourth proportional to 172.16, 236.99 and 130.61 is: 179.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.16 : 236.99 = 130.61 : x
  2. Step 2: Convert to fraction form
    172.16/236.99 = 130.61/x
  3. Step 3: Cross multiply
    172.16x = 236.99 × 130.61
  4. Step 4: Simplify right side
    172.16x = 30,951.43
  5. Step 5: Solve for x
    x = 30,951.43/172.16
  6. Step 6: Final answer
    x = 179.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.