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Finding the Fourth Proportional to 299.80, 449.70 and 260.20

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Solution

The fourth proportional to 299.80, 449.70 and 260.20 is: 390.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.80 : 449.70 = 260.20 : x
  2. Step 2: Convert to fraction form
    299.80/449.70 = 260.20/x
  3. Step 3: Cross multiply
    299.80x = 449.70 × 260.20
  4. Step 4: Simplify right side
    299.80x = 117,011.94
  5. Step 5: Solve for x
    x = 117,011.94/299.80
  6. Step 6: Final answer
    x = 390.30

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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.