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Finding the Fourth Proportional to 123.45, 184.71 and 74.73

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Solution

The fourth proportional to 123.45, 184.71 and 74.73 is: 111.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.45 : 184.71 = 74.73 : x
  2. Step 2: Convert to fraction form
    123.45/184.71 = 74.73/x
  3. Step 3: Cross multiply
    123.45x = 184.71 × 74.73
  4. Step 4: Simplify right side
    123.45x = 13,803.38
  5. Step 5: Solve for x
    x = 13,803.38/123.45
  6. Step 6: Final answer
    x = 111.81

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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.