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Finding the Fourth Proportional to 123.21, 184.85 and 42.05

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Solution

The fourth proportional to 123.21, 184.85 and 42.05 is: 63.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.21 : 184.85 = 42.05 : x
  2. Step 2: Convert to fraction form
    123.21/184.85 = 42.05/x
  3. Step 3: Cross multiply
    123.21x = 184.85 × 42.05
  4. Step 4: Simplify right side
    123.21x = 7,771.81
  5. Step 5: Solve for x
    x = 7,771.81/123.21
  6. Step 6: Final answer
    x = 63.08

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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.