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Finding the Fourth Proportional to 125.90, 172.80 and 122.49

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Solution

The fourth proportional to 125.90, 172.80 and 122.49 is: 168.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.90 : 172.80 = 122.49 : x
  2. Step 2: Convert to fraction form
    125.90/172.80 = 122.49/x
  3. Step 3: Cross multiply
    125.90x = 172.80 × 122.49
  4. Step 4: Simplify right side
    125.90x = 21,165.27
  5. Step 5: Solve for x
    x = 21,165.27/125.90
  6. Step 6: Final answer
    x = 168.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.