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Finding the Fourth Proportional to 172.61, 238.20 and 113.63

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Solution

The fourth proportional to 172.61, 238.20 and 113.63 is: 156.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.61 : 238.20 = 113.63 : x
  2. Step 2: Convert to fraction form
    172.61/238.20 = 113.63/x
  3. Step 3: Cross multiply
    172.61x = 238.20 × 113.63
  4. Step 4: Simplify right side
    172.61x = 27,065.05
  5. Step 5: Solve for x
    x = 27,065.05/172.61
  6. Step 6: Final answer
    x = 156.80

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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.