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Finding the Fourth Proportional to 123.42, 184.85 and 77.68

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Solution

The fourth proportional to 123.42, 184.85 and 77.68 is: 116.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.42 : 184.85 = 77.68 : x
  2. Step 2: Convert to fraction form
    123.42/184.85 = 77.68/x
  3. Step 3: Cross multiply
    123.42x = 184.85 × 77.68
  4. Step 4: Simplify right side
    123.42x = 14,359.15
  5. Step 5: Solve for x
    x = 14,359.15/123.42
  6. Step 6: Final answer
    x = 116.34

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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.