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Finding the Fourth Proportional to 124.82, 172.22 and 83.38

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Solution

The fourth proportional to 124.82, 172.22 and 83.38 is: 115.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.82 : 172.22 = 83.38 : x
  2. Step 2: Convert to fraction form
    124.82/172.22 = 83.38/x
  3. Step 3: Cross multiply
    124.82x = 172.22 × 83.38
  4. Step 4: Simplify right side
    124.82x = 14,359.70
  5. Step 5: Solve for x
    x = 14,359.70/124.82
  6. Step 6: Final answer
    x = 115.04

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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.