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Finding the Fourth Proportional to 172.71, 238.33 and 99.04

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Solution

The fourth proportional to 172.71, 238.33 and 99.04 is: 136.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.71 : 238.33 = 99.04 : x
  2. Step 2: Convert to fraction form
    172.71/238.33 = 99.04/x
  3. Step 3: Cross multiply
    172.71x = 238.33 × 99.04
  4. Step 4: Simplify right side
    172.71x = 23,603.45
  5. Step 5: Solve for x
    x = 23,603.45/172.71
  6. Step 6: Final answer
    x = 136.67

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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.