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Finding the Fourth Proportional to 449.66, 620.70 and 318.80

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Solution

The fourth proportional to 449.66, 620.70 and 318.80 is: 440.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.66 : 620.70 = 318.80 : x
  2. Step 2: Convert to fraction form
    449.66/620.70 = 318.80/x
  3. Step 3: Cross multiply
    449.66x = 620.70 × 318.80
  4. Step 4: Simplify right side
    449.66x = 197,879.16
  5. Step 5: Solve for x
    x = 197,879.16/449.66
  6. Step 6: Final answer
    x = 440.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.