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Finding the Fourth Proportional to 172.74, 238.40 and 99.07

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Solution

The fourth proportional to 172.74, 238.40 and 99.07 is: 136.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.74 : 238.40 = 99.07 : x
  2. Step 2: Convert to fraction form
    172.74/238.40 = 99.07/x
  3. Step 3: Cross multiply
    172.74x = 238.40 × 99.07
  4. Step 4: Simplify right side
    172.74x = 23,617.94
  5. Step 5: Solve for x
    x = 23,617.94/172.74
  6. Step 6: Final answer
    x = 136.73

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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.