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Finding the Fourth Proportional to 172.88, 238.55 and 99.18

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Solution

The fourth proportional to 172.88, 238.55 and 99.18 is: 136.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.88 : 238.55 = 99.18 : x
  2. Step 2: Convert to fraction form
    172.88/238.55 = 99.18/x
  3. Step 3: Cross multiply
    172.88x = 238.55 × 99.18
  4. Step 4: Simplify right side
    172.88x = 23,658.89
  5. Step 5: Solve for x
    x = 23,658.89/172.88
  6. Step 6: Final answer
    x = 136.86

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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.