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Finding the Fourth Proportional to 172.87, 238.57 and 99.19

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Solution

The fourth proportional to 172.87, 238.57 and 99.19 is: 136.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.87 : 238.57 = 99.19 : x
  2. Step 2: Convert to fraction form
    172.87/238.57 = 99.19/x
  3. Step 3: Cross multiply
    172.87x = 238.57 × 99.19
  4. Step 4: Simplify right side
    172.87x = 23,663.76
  5. Step 5: Solve for x
    x = 23,663.76/172.87
  6. Step 6: Final answer
    x = 136.89

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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.