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Finding the Fourth Proportional to 449.36, 672.60 and 319.60

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Solution

The fourth proportional to 449.36, 672.60 and 319.60 is: 478.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.36 : 672.60 = 319.60 : x
  2. Step 2: Convert to fraction form
    449.36/672.60 = 319.60/x
  3. Step 3: Cross multiply
    449.36x = 672.60 × 319.60
  4. Step 4: Simplify right side
    449.36x = 214,962.96
  5. Step 5: Solve for x
    x = 214,962.96/449.36
  6. Step 6: Final answer
    x = 478.38

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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.