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Finding the Fourth Proportional to 490.40, 736.20 and 271.20

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Solution

The fourth proportional to 490.40, 736.20 and 271.20 is: 407.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.40 : 736.20 = 271.20 : x
  2. Step 2: Convert to fraction form
    490.40/736.20 = 271.20/x
  3. Step 3: Cross multiply
    490.40x = 736.20 × 271.20
  4. Step 4: Simplify right side
    490.40x = 199,657.44
  5. Step 5: Solve for x
    x = 199,657.44/490.40
  6. Step 6: Final answer
    x = 407.13

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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.