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Finding the Fourth Proportional to 172.03, 237.66 and 128.92

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Solution

The fourth proportional to 172.03, 237.66 and 128.92 is: 178.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.03 : 237.66 = 128.92 : x
  2. Step 2: Convert to fraction form
    172.03/237.66 = 128.92/x
  3. Step 3: Cross multiply
    172.03x = 237.66 × 128.92
  4. Step 4: Simplify right side
    172.03x = 30,637.94
  5. Step 5: Solve for x
    x = 30,637.94/172.03
  6. Step 6: Final answer
    x = 178.10

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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.