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Finding the Fourth Proportional to 125.16, 171.26 and 123.30

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Solution

The fourth proportional to 125.16, 171.26 and 123.30 is: 168.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.16 : 171.26 = 123.30 : x
  2. Step 2: Convert to fraction form
    125.16/171.26 = 123.30/x
  3. Step 3: Cross multiply
    125.16x = 171.26 × 123.30
  4. Step 4: Simplify right side
    125.16x = 21,115.74
  5. Step 5: Solve for x
    x = 21,115.74/125.16
  6. Step 6: Final answer
    x = 168.71

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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.