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Finding the Fourth Proportional to 172.90, 239.04 and 131.38

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Solution

The fourth proportional to 172.90, 239.04 and 131.38 is: 181.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.90 : 239.04 = 131.38 : x
  2. Step 2: Convert to fraction form
    172.90/239.04 = 131.38/x
  3. Step 3: Cross multiply
    172.90x = 239.04 × 131.38
  4. Step 4: Simplify right side
    172.90x = 31,405.08
  5. Step 5: Solve for x
    x = 31,405.08/172.90
  6. Step 6: Final answer
    x = 181.64

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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.