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Finding the Fourth Proportional to 172.29, 237.62 and 123.20

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Solution

The fourth proportional to 172.29, 237.62 and 123.20 is: 169.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.29 : 237.62 = 123.20 : x
  2. Step 2: Convert to fraction form
    172.29/237.62 = 123.20/x
  3. Step 3: Cross multiply
    172.29x = 237.62 × 123.20
  4. Step 4: Simplify right side
    172.29x = 29,272.98
  5. Step 5: Solve for x
    x = 29,272.98/172.29
  6. Step 6: Final answer
    x = 169.91

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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.