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Finding the Fourth Proportional to 123.34, 185.08 and 80

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Solution

The fourth proportional to 123.34, 185.08 and 80 is: 120.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.34 : 185.08 = 80 : x
  2. Step 2: Convert to fraction form
    123.34/185.08 = 80/x
  3. Step 3: Cross multiply
    123.34x = 185.08 × 80
  4. Step 4: Simplify right side
    123.34x = 14,806.40
  5. Step 5: Solve for x
    x = 14,806.40/123.34
  6. Step 6: Final answer
    x = 120.05

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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.