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Finding the Fourth Proportional to 125.82, 172.60 and 123.12

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Solution

The fourth proportional to 125.82, 172.60 and 123.12 is: 168.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.82 : 172.60 = 123.12 : x
  2. Step 2: Convert to fraction form
    125.82/172.60 = 123.12/x
  3. Step 3: Cross multiply
    125.82x = 172.60 × 123.12
  4. Step 4: Simplify right side
    125.82x = 21,250.20
  5. Step 5: Solve for x
    x = 21,250.20/125.82
  6. Step 6: Final answer
    x = 168.89

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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.