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Finding the Fourth Proportional to 123.48, 184.21 and 111.87

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Solution

The fourth proportional to 123.48, 184.21 and 111.87 is: 166.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.48 : 184.21 = 111.87 : x
  2. Step 2: Convert to fraction form
    123.48/184.21 = 111.87/x
  3. Step 3: Cross multiply
    123.48x = 184.21 × 111.87
  4. Step 4: Simplify right side
    123.48x = 20,607.29
  5. Step 5: Solve for x
    x = 20,607.29/123.48
  6. Step 6: Final answer
    x = 166.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.