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Finding the Fourth Proportional to 172.79, 238.47 and 131.27

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Solution

The fourth proportional to 172.79, 238.47 and 131.27 is: 181.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.79 : 238.47 = 131.27 : x
  2. Step 2: Convert to fraction form
    172.79/238.47 = 131.27/x
  3. Step 3: Cross multiply
    172.79x = 238.47 × 131.27
  4. Step 4: Simplify right side
    172.79x = 31,303.30
  5. Step 5: Solve for x
    x = 31,303.30/172.79
  6. Step 6: Final answer
    x = 181.17

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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.