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Finding the Fourth Proportional to 125.40, 172.73 and 105.71

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Solution

The fourth proportional to 125.40, 172.73 and 105.71 is: 145.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.40 : 172.73 = 105.71 : x
  2. Step 2: Convert to fraction form
    125.40/172.73 = 105.71/x
  3. Step 3: Cross multiply
    125.40x = 172.73 × 105.71
  4. Step 4: Simplify right side
    125.40x = 18,258.69
  5. Step 5: Solve for x
    x = 18,258.69/125.40
  6. Step 6: Final answer
    x = 145.61

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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.