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Finding the Fourth Proportional to 172.42, 238.08 and 131.02

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Solution

The fourth proportional to 172.42, 238.08 and 131.02 is: 180.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.42 : 238.08 = 131.02 : x
  2. Step 2: Convert to fraction form
    172.42/238.08 = 131.02/x
  3. Step 3: Cross multiply
    172.42x = 238.08 × 131.02
  4. Step 4: Simplify right side
    172.42x = 31,193.24
  5. Step 5: Solve for x
    x = 31,193.24/172.42
  6. Step 6: Final answer
    x = 180.91

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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.