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Finding the Fourth Proportional to 172.16, 237.89 and 122.95

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Solution

The fourth proportional to 172.16, 237.89 and 122.95 is: 169.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.16 : 237.89 = 122.95 : x
  2. Step 2: Convert to fraction form
    172.16/237.89 = 122.95/x
  3. Step 3: Cross multiply
    172.16x = 237.89 × 122.95
  4. Step 4: Simplify right side
    172.16x = 29,248.58
  5. Step 5: Solve for x
    x = 29,248.58/172.16
  6. Step 6: Final answer
    x = 169.89

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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.