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Finding the Fourth Proportional to 172.48, 237.72 and 128.74

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Solution

The fourth proportional to 172.48, 237.72 and 128.74 is: 177.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.48 : 237.72 = 128.74 : x
  2. Step 2: Convert to fraction form
    172.48/237.72 = 128.74/x
  3. Step 3: Cross multiply
    172.48x = 237.72 × 128.74
  4. Step 4: Simplify right side
    172.48x = 30,604.07
  5. Step 5: Solve for x
    x = 30,604.07/172.48
  6. Step 6: Final answer
    x = 177.44

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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.