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Finding the Fourth Proportional to 172.40, 237.75 and 131.09

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Solution

The fourth proportional to 172.40, 237.75 and 131.09 is: 180.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 237.75 = 131.09 : x
  2. Step 2: Convert to fraction form
    172.40/237.75 = 131.09/x
  3. Step 3: Cross multiply
    172.40x = 237.75 × 131.09
  4. Step 4: Simplify right side
    172.40x = 31,166.65
  5. Step 5: Solve for x
    x = 31,166.65/172.40
  6. Step 6: Final answer
    x = 180.78

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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.