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Finding the Fourth Proportional to 123.49, 185.23 and 80.19

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Solution

The fourth proportional to 123.49, 185.23 and 80.19 is: 120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.49 : 185.23 = 80.19 : x
  2. Step 2: Convert to fraction form
    123.49/185.23 = 80.19/x
  3. Step 3: Cross multiply
    123.49x = 185.23 × 80.19
  4. Step 4: Simplify right side
    123.49x = 14,852.67
  5. Step 5: Solve for x
    x = 14,852.67/123.49
  6. Step 6: Final answer
    x = 120.28

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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.