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Finding the Fourth Proportional to 125.44, 172.80 and 119.92

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Solution

The fourth proportional to 125.44, 172.80 and 119.92 is: 165.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.44 : 172.80 = 119.92 : x
  2. Step 2: Convert to fraction form
    125.44/172.80 = 119.92/x
  3. Step 3: Cross multiply
    125.44x = 172.80 × 119.92
  4. Step 4: Simplify right side
    125.44x = 20,722.18
  5. Step 5: Solve for x
    x = 20,722.18/125.44
  6. Step 6: Final answer
    x = 165.20

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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.