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Finding the Fourth Proportional to 172.55, 238.11 and 98.90

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Solution

The fourth proportional to 172.55, 238.11 and 98.90 is: 136.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.55 : 238.11 = 98.90 : x
  2. Step 2: Convert to fraction form
    172.55/238.11 = 98.90/x
  3. Step 3: Cross multiply
    172.55x = 238.11 × 98.90
  4. Step 4: Simplify right side
    172.55x = 23,548.41
  5. Step 5: Solve for x
    x = 23,548.41/172.55
  6. Step 6: Final answer
    x = 136.47

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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.