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Finding the Fourth Proportional to 172.40, 237.82 and 123.20

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Solution

The fourth proportional to 172.40, 237.82 and 123.20 is: 169.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 237.82 = 123.20 : x
  2. Step 2: Convert to fraction form
    172.40/237.82 = 123.20/x
  3. Step 3: Cross multiply
    172.40x = 237.82 × 123.20
  4. Step 4: Simplify right side
    172.40x = 29,299.42
  5. Step 5: Solve for x
    x = 29,299.42/172.40
  6. Step 6: Final answer
    x = 169.95

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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.