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Finding the Fourth Proportional to 450.48, 621.36 and 319.56

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Solution

The fourth proportional to 450.48, 621.36 and 319.56 is: 440.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.48 : 621.36 = 319.56 : x
  2. Step 2: Convert to fraction form
    450.48/621.36 = 319.56/x
  3. Step 3: Cross multiply
    450.48x = 621.36 × 319.56
  4. Step 4: Simplify right side
    450.48x = 198,561.80
  5. Step 5: Solve for x
    x = 198,561.80/450.48
  6. Step 6: Final answer
    x = 440.78

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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.