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Finding the Fourth Proportional to 123.91, 186.05 and 121.72

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Solution

The fourth proportional to 123.91, 186.05 and 121.72 is: 182.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.91 : 186.05 = 121.72 : x
  2. Step 2: Convert to fraction form
    123.91/186.05 = 121.72/x
  3. Step 3: Cross multiply
    123.91x = 186.05 × 121.72
  4. Step 4: Simplify right side
    123.91x = 22,646.47
  5. Step 5: Solve for x
    x = 22,646.47/123.91
  6. Step 6: Final answer
    x = 182.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.