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Finding the Fourth Proportional to 172.29, 257.19 and 136.38

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Solution

The fourth proportional to 172.29, 257.19 and 136.38 is: 203.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.29 : 257.19 = 136.38 : x
  2. Step 2: Convert to fraction form
    172.29/257.19 = 136.38/x
  3. Step 3: Cross multiply
    172.29x = 257.19 × 136.38
  4. Step 4: Simplify right side
    172.29x = 35,075.57
  5. Step 5: Solve for x
    x = 35,075.57/172.29
  6. Step 6: Final answer
    x = 203.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.