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Finding the Fourth Proportional to 296.99, 445.49 and 80.57

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Solution

The fourth proportional to 296.99, 445.49 and 80.57 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    296.99 : 445.49 = 80.57 : x
  2. Step 2: Convert to fraction form
    296.99/445.49 = 80.57/x
  3. Step 3: Cross multiply
    296.99x = 445.49 × 80.57
  4. Step 4: Simplify right side
    296.99x = 35,890.50
  5. Step 5: Solve for x
    x = 35,890.50/296.99
  6. Step 6: Final answer
    x = 120.85

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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.