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Finding the Fourth Proportional to 125.58, 171.74 and 123.68

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Solution

The fourth proportional to 125.58, 171.74 and 123.68 is: 169.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.58 : 171.74 = 123.68 : x
  2. Step 2: Convert to fraction form
    125.58/171.74 = 123.68/x
  3. Step 3: Cross multiply
    125.58x = 171.74 × 123.68
  4. Step 4: Simplify right side
    125.58x = 21,240.80
  5. Step 5: Solve for x
    x = 21,240.80/125.58
  6. Step 6: Final answer
    x = 169.14

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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.